This is about the general physiology of sense organs for medical and paramedical professional beginners who choose pharmacy, nursing and physiotherapy to study.
special sense organs (anatomy and physiology) - a brief discussion Pallab Nath
brief discussion on special senses, Basic level class for technicians. topics discussed include eyes and vision, nose and sense of smell, tongue and sense of taste and ears and hearing
Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream.
special sense organs (anatomy and physiology) - a brief discussion Pallab Nath
brief discussion on special senses, Basic level class for technicians. topics discussed include eyes and vision, nose and sense of smell, tongue and sense of taste and ears and hearing
Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream.
he sense organs — eyes, ears, tongue, skin, and nose — help to protect the body. The human sense organs contain receptors that relay information through sensory neurons to the appropriate places within the nervous system.
Each sense organ contains different receptors.
General receptors are found throughout the body because they are present in skin, visceral organs (visceral meaning in the abdominal cavity), muscles, and joints.
Special receptors include chemoreceptors (chemical receptors) found in the mouth and nose, photoreceptors (light receptors) found in the eyes, and mechanoreceptors found in the ears.
Tissues, types and functions(Anatomy)- Easy explanationSwatilekha Das
Easy explanation on Tissues , types of tissues and functions of tissues with pictures.......
Easy anatomy topic for 1 st yera GNM and B.Sc nursing students.....
Human digestive system structure and function
overview
Major organs
Mouth
Esophagus
Stomach
small intestine
large intestine
Acessory organs:
Liver
gall bladder
Pancreas.
Human digestive system
Major organs
Mouth
Esophagus
Stomach
small intestine
large intestine.
Acessory organs:
Liver
Gall bladder
Pancreas.
MAJOR ORGANSThe Mouth
pH: 7
The first part of the digestive system
the entry point of food.
Structures in the mouth that aids digestion
Teeth – cut, tear, crush and grind food.
Salivary glands – produce and secrete saliva into the oral cavity.
saliva
moistens the food
contains enzymes (ptyalin or salivary amylase)
begins digestion of starch into smaller polysaccharides.
Function:
Mechanical digestion.
increasing surface area for faster chemical digestion.
The Esophagus
a tube connecting the mouth to the stomach
running through the Thoracic cavity.
Location:
lies behind windpipe (Trachea).
The trachea has as an epiglottis
preventing food from entering the windpipe,
moving the food to the esophagus while swallowing.
Food travels down the esophagus, through a series of involuntary rhythmic contractions (wave-like) called peristalsis.
Function:
The lining of the esophagus secretes mucus
lubricating
to support the movement of food.
Esophageal sphincter:
bolus reaches the stomach
must pass through a muscular ringed valve called the esophageal sphincter (Cardiac Sphincter).
Function:
prevent stomach acids from back flowing into the esophagus.
Stomach
J-shaped muscular sac
Has inner folds (rugae)
Increasing surface area of the stomach.
Function:
Stomach performs mechanical digestion
HOW By churning the bolus and mixing it with the gastric juices
secreted by the lining of the stomach.
GASTRIC JUICES HCl, salts, enzymes, water and mucus)
HCL helps break down of food and kills bacteria that came along with the food.
The bolus is now called Chyme.
Enzymes in stomach:
Acidic environment
HCl secreation
kill any microbes that are found in the bolus,
creating a pH of 2.
Mucus prevents the stomach from digesting itself.
Pepsin secreation
responsible for initiating the breakdown of proteins (in )food.
hydrolyzes proteins to yield polypeptides.
pH is 2, the enzyme from the salivary glands stops breaking down carbohydrates.
Pyloric sphincter:
chyme moves from the stomach to the small intestine.
It passes through a muscular ringed sphincter called the pyloric sphincter.
stomach does not digest itselfWhy ?
Protective Mechanism:
three protective mechanisms.
First the stomach only secretes small amounts of gastric juices until food is present.
Second the secretion of mucus coats the lining of the stomach protecting it from the gastric juices.
The third mechanism is the digestive enzyme pepsin is secreted in an inactive protein c
Skeletal system. anatomy and physiology of skeletal system. appendicular skel...mamtabisht10
SKELETAL SYSTEM
bones, cartilage and ligaments are tightly joined to form a strong, flexible framework called skeletal system
anatomy and physiology of axial and appendicular skeletal system
Axial Skeleton: The axial skeleton includes the skull, spine, ribs and sternum.
Appendicular Skeleton:
The appendicular skeleton includes the appendages of the body, which are the shoulders, arms, hips, and legs.
The urinary system, components, the urine formation process, The gross structure of the kidney, Microscope structure of the kidney, Renin-Angiotensin Aldosterone System
he sense organs — eyes, ears, tongue, skin, and nose — help to protect the body. The human sense organs contain receptors that relay information through sensory neurons to the appropriate places within the nervous system.
Each sense organ contains different receptors.
General receptors are found throughout the body because they are present in skin, visceral organs (visceral meaning in the abdominal cavity), muscles, and joints.
Special receptors include chemoreceptors (chemical receptors) found in the mouth and nose, photoreceptors (light receptors) found in the eyes, and mechanoreceptors found in the ears.
Tissues, types and functions(Anatomy)- Easy explanationSwatilekha Das
Easy explanation on Tissues , types of tissues and functions of tissues with pictures.......
Easy anatomy topic for 1 st yera GNM and B.Sc nursing students.....
Human digestive system structure and function
overview
Major organs
Mouth
Esophagus
Stomach
small intestine
large intestine
Acessory organs:
Liver
gall bladder
Pancreas.
Human digestive system
Major organs
Mouth
Esophagus
Stomach
small intestine
large intestine.
Acessory organs:
Liver
Gall bladder
Pancreas.
MAJOR ORGANSThe Mouth
pH: 7
The first part of the digestive system
the entry point of food.
Structures in the mouth that aids digestion
Teeth – cut, tear, crush and grind food.
Salivary glands – produce and secrete saliva into the oral cavity.
saliva
moistens the food
contains enzymes (ptyalin or salivary amylase)
begins digestion of starch into smaller polysaccharides.
Function:
Mechanical digestion.
increasing surface area for faster chemical digestion.
The Esophagus
a tube connecting the mouth to the stomach
running through the Thoracic cavity.
Location:
lies behind windpipe (Trachea).
The trachea has as an epiglottis
preventing food from entering the windpipe,
moving the food to the esophagus while swallowing.
Food travels down the esophagus, through a series of involuntary rhythmic contractions (wave-like) called peristalsis.
Function:
The lining of the esophagus secretes mucus
lubricating
to support the movement of food.
Esophageal sphincter:
bolus reaches the stomach
must pass through a muscular ringed valve called the esophageal sphincter (Cardiac Sphincter).
Function:
prevent stomach acids from back flowing into the esophagus.
Stomach
J-shaped muscular sac
Has inner folds (rugae)
Increasing surface area of the stomach.
Function:
Stomach performs mechanical digestion
HOW By churning the bolus and mixing it with the gastric juices
secreted by the lining of the stomach.
GASTRIC JUICES HCl, salts, enzymes, water and mucus)
HCL helps break down of food and kills bacteria that came along with the food.
The bolus is now called Chyme.
Enzymes in stomach:
Acidic environment
HCl secreation
kill any microbes that are found in the bolus,
creating a pH of 2.
Mucus prevents the stomach from digesting itself.
Pepsin secreation
responsible for initiating the breakdown of proteins (in )food.
hydrolyzes proteins to yield polypeptides.
pH is 2, the enzyme from the salivary glands stops breaking down carbohydrates.
Pyloric sphincter:
chyme moves from the stomach to the small intestine.
It passes through a muscular ringed sphincter called the pyloric sphincter.
stomach does not digest itselfWhy ?
Protective Mechanism:
three protective mechanisms.
First the stomach only secretes small amounts of gastric juices until food is present.
Second the secretion of mucus coats the lining of the stomach protecting it from the gastric juices.
The third mechanism is the digestive enzyme pepsin is secreted in an inactive protein c
Skeletal system. anatomy and physiology of skeletal system. appendicular skel...mamtabisht10
SKELETAL SYSTEM
bones, cartilage and ligaments are tightly joined to form a strong, flexible framework called skeletal system
anatomy and physiology of axial and appendicular skeletal system
Axial Skeleton: The axial skeleton includes the skull, spine, ribs and sternum.
Appendicular Skeleton:
The appendicular skeleton includes the appendages of the body, which are the shoulders, arms, hips, and legs.
The urinary system, components, the urine formation process, The gross structure of the kidney, Microscope structure of the kidney, Renin-Angiotensin Aldosterone System
Filipino 6 Yunit IV Aralin 32: Pagpapahayag ng Sariling Palagay
- Paggamit ng mga Pang- ukol sa pagpapahayag at pagbibigay ng palagay
-Pagsulat ng mga pangungusap na ginagamit ang mga pang- ukol
Developmental Reading is a course wherein future teachers learn how to teach reading to their learners and how to track their development in reading and other significant macro skills.
Its a description about urinary system. Beginners of pharmacy, physiotherapy, nursing and allied health sciences may find it useful. The material is prepared by studying Ross and Wilson, Gyton and Tortora of Human anatomy and physiology.
General principles of research methodology. Terms frequently used in this chapter. It is a course subject for fourth Pharm D in The Tamilnadu Dr.MGR. Medical University, Chennai.
This material is prepared for the beginners of medical and Paramedical professionals. The books referred were Tortora, Gyton and Ross and Wilson for Human Anatomy and physiology. Leave a comment if you find it useful which would make me to upload more study materials for the beneficiaries.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
2. INTRODUCTI
ON
•Sensory organs have special receptors that allow
us to smell, taste, see, hear, and maintain
equilibrium or balance.
•Information conveyed from these receptors to
the central nervous system is used to help
maintain homeostasis.
•The organs used for these functions are eye, ear,
tongue and skin.
GLADYS STEPHEN MPHARM 2
3. EYE
•More than half the sensory receptors in the human body are
located in the eyes, and a large part of the cerebral cortex is
devoted to processing visual information.
•Accessory Structures of the Eye
•The accessory structures of the eye include the eyelids,
eyelashes, eyebrows, the lacrimal (tearing) apparatus, and
extrinsic eye muscles.
•Anatomical parts of eye are
•cornea, iris, pupil, lens, retina, macula, optic nerve, choroid
and vitreous.
GLADYS STEPHEN MPHARM 3
4. • Cornea: clear front window of the eye that transmits and focuses light into
the eye.
• Iris: colored part of the eye that helps regulate the amount of light that
enters
• Pupil: dark aperture in the iris that determines how much light is let into
the eye
• Lens: transparent structure inside the eye that focuses light rays onto the
retina
• Retina: nerve layer that lines the back of the eye, senses light, and creates
electrical impulses that travel through the optic nerve to the brain
• Macula: small central area in the retina that contains special light-
sensitive cells and allows us to see fine details clearly
• Optic nerve: connects the eye to the brain and carries the electrical
impulses formed by the retina to the visual cortex of the brain
• Vitreous: clear, jelly-like substance that fills the middle of the eye.
GLADYS STEPHEN MPHARM 4
6. Physiology of Vision
•Light waves from an object (such as a tree) enter the eye first through
the cornea, which is the clear dome at the front of the eye.
•It is like a window that allows light to enter the eye.
•The light then progresses through the pupil, the circular opening in the
center of the colored iris.
•Fluctuations in the intensity of incoming light change the size of the
eye’s pupil.
•As the light entering the eye becomes brighter, the pupil will constrict
(get smaller), due to the pupillary light response.
•As the entering light becomes dimmer, the pupil will dilate (get larger).
•Contd…GLADYS STEPHEN MPHARM 6
7. • Initially, the light waves are bent or converged first by the cornea, and
then further by the crystalline lens (located immediately behind the
iris and the pupil), to a nodal point (N) located immediately behind
the back surface of the lens.
• At that point, the image becomes reversed (turned backwards) and
inverted (turned upside-down).
• The light continues through the vitreous humor, (the clear gel that
makes up about 80% of the eye’s volume), and then, ideally, back to a
clear focus on the retina, behind the vitreous.
• The small central area of the retina is the macula, which provides the
vision of any location in the retina.
• In the retina, rods and cones initiate visual signals and relay them to
bipolar cells, which transmit the signals to ganglion cells.GLADYS STEPHEN MPHARM 7
8. • The retina registers the tiny photons of light interacting with it.
• Within the layers of the retina, light impulses are changed into
electrical signals.
• Then they are sent through the optic nerve, along the visual
pathway, to the occipital cortex at the posterior (back) of the
brain.
• Here, the electrical signals are interpreted or “seen” by the brain
as a visual image.
GLADYS STEPHEN MPHARM 8
9. Disorders of eye
•Myopia (Near Sighted ness)
•Near-sightedness is a common eye condition in which faraway objects appear
blurry.
•Hyperopia (far sighted ness)
•Farsightedness means it’s easy to see things that are far away, but your close-
up vision (near vision) is blurry.
•Astigmatism
•Astigmatism is a common vision problem caused by an error in the shape of the
cornea. With astigmatism, the lens of the eye or the cornea, which is the front
surface of the eye, has an irregular curve. This can change the way light passes,
or refracts, to your retina. This causes blurry, fuzzy, or distorted vision.
GLADYS STEPHEN MPHARM 9
10. • Presbyopia:
• Presbyopia is an eye condition in which your eye slowly loses the
ability to focus quickly on objects that are close.
• Cataract
• A cataract is a clouding of the eye's natural lens, which lies behind
the iris and the pupil.
• Glaucoma
• Glaucoma is an eye disease that can damage your optic nerve.
The optic nerve supplies visual information to your brain from
your eyes. Glaucoma is usually, the result of abnormally high
pressure inside your eye.
GLADYS STEPHEN MPHARM 10
11. • Night blindness
• Night blindness is also called “nyctalopia.” It’s a type of
vision impairment. People with night blindness experience
poor vision at night or in dimly lit environments.
• Strabismus
• Crossed eyes is also called strabismus, a condition in which
your eyes don’t line up. If you have this condition, your eyes
look in different directions. And each eye will focus on a
different object.
GLADYS STEPHEN MPHARM 11
12. Ear
•The ear can transduce sound vibrations with small amplitudes into
electrical signals 1000 times faster than photoreceptors can respond to
light.
•Besides receptors for sound waves, the ear also contains receptors for
equilibrium.
•Anatomy of ear
•The ear is divided into three main regions:
•(1) the external ear, which collects sound waves and channels them
inward;
•(2) the middle ear, which conveys sound vibrations to the oval window;
•(3) the internal ear, which houses the receptors for hearing and
equilibrium.
GLADYS STEPHEN MPHARM 12
15. EXTERNAL EAR
•Ear consists of three parts, namely
•external ear,
•middle ear and
•internal ear.
•External ear is formed by two parts:
1.Auricle or pinna
2.External auditory meatus.
GLADYS STEPHEN MPHARM 15
16. MIDDLE EAR
•Middle ear or tympanic cavity is a small, narrow, irregular, laterally
compressed chamber, situated within the temporal bone.
•It is also known as tympanum. It is separated from external auditory
meatus by tympanic membrane.
•Middle ear consists of the following structures:
•1. Auditory ossicles
•i. Malleus
•ii. Incus
•iii. Stapes.
•2. Auditory muscles
•3. Eustachian tube. GLADYS STEPHEN MPHARM 16
17. INTERNAL EAR
•Internal ear or labyrinth is a membranous structure,
enclosed by a bony labyrinth in petrous part of
temporal bone.
•It consists the sense organs of hearing and
equilibrium. Sense organ for hearing is the cochlea and
the sense organ for equilibrium is the vestibular
apparatus.
GLADYS STEPHEN MPHARM 17
18. Sense of Equilibrium
•The sense of equilibrium consists of two parts: static
and dynamic equilibrium.
• 1. The organs of static equilibrium help to
maintain the position of the head when the head and
body are still.
• 2. The organs of dynamic equilibrium help
to maintain balance when the head and body suddenly
move and rotate.
GLADYS STEPHEN MPHARM 18
19. Static Equilibrium
• 1. The organs of static equilibrium are located within the bony
vestibule of the inner ear, inside the utricle and saccule (expansions of the
membranous labyrinth).
• 2. A macula, consisting of hair cells and supporting cells,
lies inside the utricle and saccule.
• 3. The hair cells contact gelatinous material holding
otoliths.
• 4. Gravity causes the gelatin and otoliths to shift, bending
hair cells and generating a nervous impulse.
• 5. Impulses travel to the brain via the vestibular branch of
the vestibulocochlear nerve, indicating the position of the head
GLADYS STEPHEN MPHARM 19
20. Dynamic Equilibrium
• 1. The three semicircular canals detect motion of the head,
and they aid in balancing the head and body during sudden movement.
• 2. The organs of dynamic equilibrium are called cristae
ampullaris, and are located in the ampulla of each semicircular canal of the
inner ear.
• 3. Hair cells extend into a dome-shaped gelatinous cupula.
•Rapid turning of the head or body generates impulses as the cupula and
hair cells bend.
•Mechanoreceptors associated with the joints, and the changes detected
by the eyes also help maintain equilibrium.
GLADYS STEPHEN MPHARM 20
21. • Conclusion
• The human sense of hearing is attributed to the auditory system, which uses the
ear to collect, amplify, and transduce sound waves into electrical impulses that
allow the brain to perceive and localize sounds.
• The ear can be divided into the outer ear, middle ear, and inner ear, each of
which has a specific function in the process of hearing.
• The outer ear is responsible for the collection and amplification of sound. The air-
filled middle ear transforms sound waves into vibrations, protecting the inner ear
from damage. The fluid-filled inner ear transduces sound vibrations into
neural signals that are sent to the brain for processing.
• The cochlea is the major sensory organ of hearing within the inner ear. Hair cells
within the cochlea perform the transduction of sound waves.
• Humans are capable of estimating a sound's origin through a process called
sound localization, which relies on timing and intensity differences in sound
waves collected by each of our two ears.GLADYS STEPHEN MPHARM 21
22. Skin
•The integumentary system contributes to homeostasis by protecting
the body and helping regulate body temperature.
•It also allows you to sense pleasurable, painful, and other stimuli in
your external environment.
•The integumentary system is composed of the skin, hair, oil and sweat
glands, nails, and sensory receptors.
GLADYS STEPHEN MPHARM 22
23. • The integumentary system helps maintain a constant body temperature,
protects the body, and provides sensory information about the
surrounding environment.
• Of all the body’s organs, none is more easily inspected or more exposed
to infection, disease, and injury than the skin.
• Because of its visibility, skin reflects our emotions (frowning, blushing)
and some aspects of normal physiology (such as sweating).
• Changes in skin color may also indicate homeostatic imbalances in the
body. For example, the bluish skin color associated with hypoxia (oxygen
deficiency at the tissue level) is one sign of heart failure as well as other
disorders.
• Abnormal skin eruptions or rashes such as chickenpox, cold sores, or
measles may reveal systemic infections or diseases of internal organs.
GLADYS STEPHEN MPHARM 23
24. • Components of the integumentary system. The skin consists of a
superficial, thin epidermis and a deep, thicker dermis.
• Deep to the skin is the subcutaneous layer, which attaches the dermis
to underlying fascia.
• The integumentary system includes the skin, hair, oil and sweat
glands, nails, and sensory receptors.
• Skin Glands
• Glands are epithelial cells that secrete a substance. Several kinds of
exocrine glands are associated with the skin: sebaceous (oil) glands,
sudoriferous (sweat) glands, and ceruminous glands.
GLADYS STEPHEN MPHARM 24
27. • Functions of skin
• Thermoregulation
• The skin contributes to thermoregulation in two ways: by liberating
sweat at its surface and by adjusting the flow of blood in the dermis.
• Blood Reservoir
• The dermis houses an extensive network of blood vessels that carry 8–
10% of the total blood flow in a resting adult. For this reason, the skin
acts as a blood reservoir.
• Protection
• The skin provides protection to the body in various ways. Keratin
protects underlying tissues from microbes, abrasion, heat, and chemicals
and the tightly interlocked keratinocytes resist invasion by microbes.
GLADYS STEPHEN MPHARM 27
28. • Cutaneous Sensations
• Cutaneous sensations are sensations that arise in the skin, including
tactile sensations—touch, pressure, vibration, and tickling—as well as
thermal sensations such as warmth and coolness.
• Excretion and Absorption
• The skin normally has a small role in excretion, the elimination of
substances from the body, and absorption, the passage of materials from
the external environment into body cells.
• Synthesis of Vitamin D
• Synthesis of vitamin D requires activation of a precursor molecule in the
skin by ultraviolet (UV) rays in sunlight.
GLADYS STEPHEN MPHARM 28
29. • For further reference go through the site given below:
https://www.boundless.com/psychology/textbooks/boundless-
psychology-textbook/sensation-and-perception-5/sensory-processes-
38/audition-hearing-the-ear-and-sound-localization-162-
12697/images/anatomy-of-the-ear/
GLADYS STEPHEN MPHARM 29