The document summarizes key aspects of pregnancy, fetal development, placental function, and lactation. It describes how fertilization occurs and the roles of hormones like HCG, estrogen, and progesterone in pregnancy. The placenta facilitates nutrient/gas exchange between mother and fetus by diffusion. Parturition is induced by hormonal and mechanical changes, culminating in uterine contractions. Lactation is stimulated by prolactin and facilitated by oxytocin-induced milk ejection in response to suckling.
Female reproductive functions can be divided into two major phases:
preparation of the female body for conception and pregnancy and
(2) the period of pregnancy itself.
This lecture is concerned with preparation of the female body for pregnancy, and presents the physiology of pregnancy and childbirth
Male reproductive system by Pandian M, tutor, Dept of Physiology, DYPMCKOP,MHPandian M
Male reproductive functions
The male reproductive tract
Sagittal segments of testes and epididymis
Adolescence
General Physical Changes
Stages of spermatogenesis
Structure of the human spermatozoon.
Pathway for the passage of sperms
Semen
Composition & function
Capacitation
Factors affecting spermatogenesis
Hormones necessary for spermatogenesis
Functions of testosterone
Disorders of sexual development / applied
The active principles of the endocrine glands are called hormones.
Hormones are specific chemical substances discharged directly into the blood.
The blood distributes the hormones through out the body.
Female reproductive functions can be divided into two major phases:
preparation of the female body for conception and pregnancy and
(2) the period of pregnancy itself.
This lecture is concerned with preparation of the female body for pregnancy, and presents the physiology of pregnancy and childbirth
Male reproductive system by Pandian M, tutor, Dept of Physiology, DYPMCKOP,MHPandian M
Male reproductive functions
The male reproductive tract
Sagittal segments of testes and epididymis
Adolescence
General Physical Changes
Stages of spermatogenesis
Structure of the human spermatozoon.
Pathway for the passage of sperms
Semen
Composition & function
Capacitation
Factors affecting spermatogenesis
Hormones necessary for spermatogenesis
Functions of testosterone
Disorders of sexual development / applied
The active principles of the endocrine glands are called hormones.
Hormones are specific chemical substances discharged directly into the blood.
The blood distributes the hormones through out the body.
Growth of the fetus begins soon after fertilization, when the first cell division occurs.
Cell division, hypertrophy, and differentiation are highly coordinated events that result in the growth and development of specialized organ systems.
The fetus, fetal membranes, and placenta develop and function as a unit throughout pregnancy, and their development is interdependent or symbiotic.
The growth trajectory of fetal mass is relatively flat during the first trimester, increases linearly at the beginning of the second trimester, and rises rapidly during the third trimester.
LOCATION: WALL OF GUT
NEURONS: 100 MILLIONS
GIT MOVEMENTS AND SECRETIONS
COMPOSED: TWO PLEXUSES
OUTER PLEXUS (MYENTERIC AND AUERBACH'S PLEXUS)
INNER PLEXUS (MEISSNER'S PLEXUS AND SUBMUCOSAL PLEXUS)
MYENTERIC PLEXUS
GI MOVEMENTS
SUBMUCOSAL PLEXUS
SECRETION AND LOCAL BLOOD FLOW
organic biologically active compounds of different chemical nature that are produced by the endocrine glands, enter directly into blood and accomplish humoral regulation of the metabolism of compounds and functions on the organism level.
Growth of the fetus begins soon after fertilization, when the first cell division occurs.
Cell division, hypertrophy, and differentiation are highly coordinated events that result in the growth and development of specialized organ systems.
The fetus, fetal membranes, and placenta develop and function as a unit throughout pregnancy, and their development is interdependent or symbiotic.
The growth trajectory of fetal mass is relatively flat during the first trimester, increases linearly at the beginning of the second trimester, and rises rapidly during the third trimester.
LOCATION: WALL OF GUT
NEURONS: 100 MILLIONS
GIT MOVEMENTS AND SECRETIONS
COMPOSED: TWO PLEXUSES
OUTER PLEXUS (MYENTERIC AND AUERBACH'S PLEXUS)
INNER PLEXUS (MEISSNER'S PLEXUS AND SUBMUCOSAL PLEXUS)
MYENTERIC PLEXUS
GI MOVEMENTS
SUBMUCOSAL PLEXUS
SECRETION AND LOCAL BLOOD FLOW
organic biologically active compounds of different chemical nature that are produced by the endocrine glands, enter directly into blood and accomplish humoral regulation of the metabolism of compounds and functions on the organism level.
physiological changes during pregnancy
effect of pregnancy on physiological functions during pregnancy
cardiovascular, respiratory and hormonal changes
Shifa Riaz
gynecology
obstetrics
females
This power point presentation explains the female reproductive system briefly. It explains about different stages of female reproduction i.e. puberty, menarche, menstruation, pregnancy, menopause etc.
Maternal physiological changes in pregnancy are the adaptations during pregnancy that a woman's body undergoes to accommodate the growing embryo or fetus. ... The pregnant woman and the placenta also produce many other hormones that have a broad range of effects during the pregnancy.
Assessment and management of pregnancy (antenatal) ppt.pptxMeenakshiJohn1
In this assessment and management describe about the reproductive health ,disorder of reproductive health and about pre conception ,genetic counseling and the physiological changes in the reproductive system of pregnant women .briefly knowledge about hematological changes and also the changes of cardiovascular system during pregnancy . the important role of endocrine gland during pregnancy .thyroid and the important role of a hormones and their maintenance .and their minor ailments in pregnancy or discomforts of pregnancy .sign and symptoms of pregnancy
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Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
Prix Galien International 2024 Forum ProgramLevi Shapiro
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- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
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- GENE THERAPY
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- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
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New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
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The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
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Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
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Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
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This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
2. • If the ovum becomes fertilized, a new sequence
of events called gestation or pregnancy takes
place.
• The fertilized ovum eventually develops into a
full-term fetus.
• Fertilization of the ovum normally takes place in
the ampulla of one of the fallopian tubes.
• The 23 unpaired chromosomes of the male
pronucleus and the 23 unpaired chromosomes of
the female pronucleus align themselves to re-
form a complete complement of 46
chromosomes (23 pairs) in the fertilized ovum or
zygote.
3. WHAT DETERMINES THE SEX OF THE FETUS
THAT IS CREATED?
X chromosome (the female chromosome).
Y chromosome (the male chromosome).
XX combination, a female child will be born.
XY combination, a male child will be born.
4. EARLY NUTRITION OF THE EMBRYO
ANATOMY AND FUNCTION OF THE PLACENTA:
• The total surface area of all the villi of
the mature placenta is only a few
square meters—many times less than
the area of the pulmonary membrane
in the lungs.
• Nutrients and other substances pass
through this placental membrane
mainly by diffusion in much the same
manner that diffusion occurs through
the alveolar membranes of the lungs
and the capillary membranes
elsewhere in the body.
5. PLACENTAL PERMEABILITY AND
MEMBRANE DIFFUSION
CONDUCTANCE
• The major function of the
placenta is to provide for
diffusion of foodstuffs and
oxygen from the mother’s
blood into the fetus’s blood
and diffusion of excretory
products from the fetus back
into the mother.
• Diffusion of Oxygen Through
the Placental Membrane is:
The same principles for
diffusion of oxygen through
the pulmonary membrane,
which means by simple
diffusion.
6. • The mean partial pressure of oxygen (PO2) of
the mother’s blood in the placental sinuses is
about 50 mm Hg.
• The mean po2 in the fetal blood after it becomes
oxygenated in the placenta 30 mm Hg.
• The mean pressure gradient for diffusion of
oxygen through the placental membrane is
about 20 mm Hg.
Three reasons why even this low
PO2 is capable of allowing the
fetal blood to transport almost as
much oxygen to the fetal tissues.
1. The hemoglobin of the fetus is
mainly fetal hemoglobin (more
carry oxyg).
2. The hemoglobin concentration
of fetal blood is about 50
percent greater than that of
the mother.
3. Double bohr effect: low partial
pressure of carbon dioxide in
fetal blood due to exerted co2
by the fetus will increase the
affinity of o2
7. HORMONAL FACTORS IN PREGNANCY:
• In pregnancy, the placenta forms especially
large quantities:
1. Human chorionic gonadotropin,
2. Estrogens,
3. Progesterone
4. Human chorionic
somatomammotropin,
8. 1- Function of Human Chorionic Gonadotropin
• Human chorionic gonadotropin is a glycoprotein having a
molecular weight of about 39,000.
• Function of HCG
• Persistence of the corpus luteum and prevents menstruation.
• Human chorionic gonadotropin stimulates the male fetal testes
to produce testosterone.
2- ESTROGENS
• A syncytial trophoblast cells of the placenta.
• Enlargement of the mother’s uterus.
• Enlargement of the mother’s breasts and growth of the breast
ductal structure, enlargement of the mother’s female external
genitalia.
• Relax the pelvic ligaments of the mother.
• Rate of cell reproduction in the early embryo.
9. 3- PROGESTERONE
• Causes decidual cells to develop in the uterine endometrium. These
cells play an important role in the nutrition of the early embryo.
• Decreases the contractility of the pregnant uterus.
• Contributes to the development of the conceptus even before
implantation.
• Helps estrogen prepare the mother’s breasts for lactation,
4- HUMAN CHORIONIC
SOMATOMAMMOTROPIN
• Often called placental lactogen. It acts like prolactin and growth hormone.
• Enlargement of mammary glands and induces lactation.
• like GH on protein metabolism.
• It reduces the peripheral utilization of glucose in the mother.
• It mobilizes fat from the adipose tissue of the mother
10. • FETOPLACENTAL UNIT:
• Refers to the interaction between fetus and
placenta in the formation of steroid hormones.
• The interaction between fetus and placenta occurs
because some of the enzymes involved in steroid
synthesis present in fetus are absent in placenta
and those enzymes, which are absent in fetus are
present in placenta.
11. Other Hormonal Factors in Pregnancy
a) Pituitary Secretion:
• The anterior pituitary gland increases its production
of corticotropin, thyrotropin, and prolactin.
• Pituitary secretion of FSH and LH is almost totally
suppressed as a result of the inhibitory effects of
estrogens and progesterone from the placenta.
b) Increased Corticosteroid Secretion:
• Glucocorticoids is moderately increased.
• Twofold increase in aldosterone secretion (pegnancy
induced hypertension).
12. c) Increased Thyroid Gland Secretion:
• Increases its production of thyroxine, and small quantities
of a specific thyroid-stimulating hormone, called human
chorionic thyrotropin.
d) Increased Parathyroid Gland Secretion:
• Enlarge during pregnancy due to insufficiency of Ca in diet.
e) Secretion of “Relaxin” by the Ovaries and Placenta:
• Secreted by the corpus luteum of the ovary and by
placental tissues.
• Its secretion is increased by a stimulating effect of human
chorionic gonadotropin.
• Relaxin is a 48–amino acid polypeptide with a molecular
weight of about 9000.
• Cause relaxation of the pelvic ligaments.
13. Changes in the pregnant woman:
1- Response of the Mother’s Body to Pregnancy:
• The uterus increases from about 50 grams to 1100 grams, and the
breasts approximately double in size.
• The vagina enlarges and the introitus opens more widely.
• The development of edema, acne, and masculine or acromegalic
features.
2- Weight Gain in the Pregnant Woman:
• The average weight gain during pregnancy is about 25 to 35 pounds.
• During pregnancy, a woman often has a greatly increased desire for
food.
3- Metabolism During Pregnancy:
• Secretion of many hormones during pregnancy, including thyroxine,
adrenocortical hormones, and the sex hormones, the basal metabolic
rate of the pregnant woman increases about 15%.
• The extra load she is carrying (fetus), greater amounts of energy than
normal must be expended for muscle activity.
14. 4- Nutrition During Pregnancy:
• Ordinarily, the mother does not absorb sufficient protein,
calcium, phosphates, and iron, Vit D, Vit K from her diet during
the last months of pregnancy to supply these extra needs of the
fetus. To over ride these the mother should take a
supplementary food.
5- Changes in the Maternal Circulatory System During Pregnancy:
• Blood flow through the placenta and maternal cardiac output
increase during pregnancy.
• Maternal blood volume increases during pregnancy.
6- Maternal Respiration Increases During Pregnancy:
• the high levels of progesterone and the increased basal
metabolism during pregnancy increase the minute ventilation
even more.
7- Maternal Kidney Function During Pregnancy:
• The rate of urine formation by a pregnant woman is usually
slightly increased because of increased fluid intake and
increased load of excretory products.
15. Amniotic Fluid and Its Formation
• Normally, the volume of amniotic fluid
(the fluid inside the uterus in which the
fetus floats) is between 500 milliliters
and 1 liter.
• A large portion of the fluid is derived
from renal excretion by the fetus.
Preeclampsia and Eclampsia
Preeclamsia toxemia of
pregnancy:
1- Increased BP.
2- Edema.
3- Protenurea.
Eclamsia:
Preeclamsia + Convulsion
16.
17. • Parturition: means birth of the baby.
• Two major categories of effects lead up to the intense
contractions responsible for parturition:
(1) Progressive hormonal changes that cause increased
excitability of the uterine musculature.
(2) Progressive mechanical changes.
• Hormonal Factors That Increase Uterine Contractility:
A. Increased Ratio of Estrogens to Progesterone (estrogens
have a definite tendency to increase the degree of
uterine contractility).
B. Oxytocin Causes Contraction of the Uterus.
C. Effect of Fetal Hormones on the Uterus (secretion of
oxytosin, fetus’s adrenal glands secrete large quantities
of cortisol ).
18. • Mechanical Factors That Increase Uterine Contractility:
A. Stretch of the Uterine Musculature (fetal movements,
twins born earlier than single).
B. Stretch or Irritation of the Cervix (obstetricians frequently
induce labor by rupturing the membranes).
• ONSET OF LABOR—A POSITIVE FEEDBACK MECHANISM
FOR ITS INITIATION:
• Braxton Hicks contractions: is the periodic episodes of weak
and slow rhythmical contractions of the uterus. It’s painless.
• Braxton Hicks contractions are triggered by several factors
such as:
1. Touching the abdomen
2. Movement of fetus in uterus
3. Physical activity
4. Sexual intercourse
5. Dehydration.
19. The false labor contractions are believed
to help cervical dilatation.
Remember that for a positive feedback to
continue, each new cycle of the positive
feedback must be stronger than the previous
one.
ABDOMINAL MUSCLE CONTRACTIONS
DURING LABOR:
Once uterine contractions become strong
during labor, pain signals originate both from
the uterus and from the birth canal.
These signals, in addition to causing
suffering,
elicit neurogenic reflexes in the spinal cord to
the abdominal muscles, causing intense
contractions of these muscles.
20. STAGES OF PARTURITION:
• First Stage:
• Labor contractions arise from fundus
of uterus and move downwards so that
the head of fetus is pushed against
cervix.
• Second Stage:
• The fetus is delivered out from uterus
through cervix and vaginal canal. This
stage lasts for about 1 hour.
• Third Stage:
• The placenta is detached from the
decidua and is expelled out from
uterus. It occurs within 10 to 15
minutes after the delivery of the child.
• Involution of the Uterus After
Parturition:
• Endometrial surface autolyzes, causing
a vaginal discharge known as lochia,
which is first bloody and then serous in
nature and continues for a total of
about 10 days
Hormones involved in the
process of parturition
• Maternal Hormones:
1. Oxytocin
2. Prostaglandins
3. Cortisol
4. Catecholamines
5. Relaxin.
• Fetal Hormones
1. Oxytocin
2. Cortisol
3. Prostaglandins.
• Placental Hormones
1. Estrogen
2. Progesterone
3. Prostaglandins.
21.
22. DEVELOPMENT OF
THE BREASTS:
• The breasts begin to develop at
puberty.
• Estrogens Stimulate Growth of
the Ductal System of the Breasts.
• Growth of the ductal system are
at least four other hormones:
1. Growth hormone.
2. Prolactin.
3. Adrenal glucocorticoids.
4. Insulin.
• Progesterone Is Required for Full
Development of the Lobule-
Alveolar System.
23. PROLACTIN PROMOTES LACTATION
• Prolactin: is secreted by the mother’s anterior pituitary
gland, and its concentration in her blood rises steadily
from the fifth week of pregnancy until birth of the baby.
• The placenta secretes large quantities of human chorionic
somatomammotropin, which probably has lactogenic
properties.
• The fluid secreted during the last few days before and the
first few days after parturition is called colostrum; it
contains essentially the same concentrations of proteins
and lactose as milk, but it has almost no fat.
• Growth hormone, cortisol, parathyroid hormone, and
insulin: are necessary to provide the amino acids, fatty
acids, glucose, and calcium required for the formation of
milk.
24. • The Hypothalamus Secretes Prolactin Inhibitory
Hormone:
• The hypothalamus mainly stimulates production of all the
other hormones, but it mainly inhibits prolactin
production.
• The catecholamine dopamine, which is known to be
secreted by the arcuate nuclei of the hypothalamus and
can decrease prolactin secretion as much as 10-fold.
• Suppression of the Female Ovarian Cycles in Nursing
Mothers for Many Months After Delivery:
• Increased prolactin—inhibit secretion of gonadotropin-
releasing hormone by the hypothalamus.
• This inhibition, in turn, suppresses formation of the
pituitary gonadotropic hormones—luteinizing hormone
and follicle-stimulating hormone.
25. EJECTION (OR “LET-DOWN”) PROCESS
IN MILK SECRETION—FUNCTION OF OXYTOCIN
• Milk is secreted continuously into the alveoli of the
breasts, but it does not flow easily from the alveoli
into the ductal system and, therefore, does not
continually leak from the nipples.
• When the baby suckles, it receives virtually no milk
for the first half minute or so.
• Suckling on one breast causes milk flow not only in
that breast but also in the opposite breast.
• Inhibition of Milk Ejection:
• Many psychogenic factors or even generalized
sympathetic nervous system stimulation throughout
the mother’s body can inhibit oxytocin secretion and
consequently depress milk ejection.
26. • Antibodies and Other Anti-infectious Agents in
Milk:
• Multiple types of antibodies and other anti-
infectious agents are secreted in milk along with the
nutrients.
• Several different types of white blood cells are
secreted, including both neutrophils and
macrophages.