Cardiac output is the volume of blood pumped by the heart each minute. It is calculated as stroke volume multiplied by heart rate. Stroke volume is the volume of blood pumped from the left ventricle with each beat. Factors that affect cardiac output include body metabolism, exercise level, age, and body size. Cardiac output increases with exercise and decreases with age. It is tightly regulated to meet the metabolic demands of the body's tissues.
Cardiac output (The Guyton and Hall Physiology)Maryam Fida
The volume of blood pumped by each ventricle per minute is called cardiac output
Cardiac output = Stroke Volume X Heart Rate
Normal value = 5 Liters /Minute
Cardiac output = Stroke Volume X Heart Rate
The factors which regulate stroke volume and Heart rate are basically regulating Cardiac output
Volume of blood ejected by each ventricle in single systole; Normal Value = 70 ml/beat
Stroke Volume = End diastolic Volume – End Systolic Volume
So stroke volume is mainly controlled by
EDV
ESV
VENOUS RETURN: What ever blood volume returns to the heart, same is pumped forward through the Frank’s Starlings Law. According to this law 13- 15 liters of blood volume can be pumped out without cardiac stimulation.
DURATION OF DIASTOLE OR FILLING TIME: ventricular filling occurs during diastole, so there must be adequate ventricular filling time.
DISTENSIBILITY OF THE VENTRICLES: Normally ventricles are distensible to accommodate adequate blood volume. Infarction decreases the distensibility which decreases the EDV.
ATRIAL CONTRACTION: There must be adequate atrial contraction to have adequate EDV. If atrial function is not adequate then EDV will decrease.
E.S.V is basically CONTROLLED BY MYOCARDIAL CONTRACTION
FORCE OF MYOCARDIAL CONTRACTION: It depends upon the initial length of muscle fibers according to frank’s starlings law.
PRELOAD: The effect of EDV on initial length is called preload. So EDV also effects the ESV.
AFTER LOAD: Force of contraction is also dependant upon the resistance against which the ventricles have to pump
CONDITION OF THE MYOCARDIUM : It also effects the force of contraction.
AUTONOMIC NERVES : Sympathetic stimulation increases and parasympathetic stimulation decreases force of contraction
HORMONES: Catecholamines, thyroxine, glucagon, digitalis, calcium, increased temp, caffeine, theophyline increase the force.
Force decreases by hypoxia, acidosis, barniturates, procainamide and quinidine decrease the force of contraction.
Cardiac output (The Guyton and Hall Physiology)Maryam Fida
The volume of blood pumped by each ventricle per minute is called cardiac output
Cardiac output = Stroke Volume X Heart Rate
Normal value = 5 Liters /Minute
Cardiac output = Stroke Volume X Heart Rate
The factors which regulate stroke volume and Heart rate are basically regulating Cardiac output
Volume of blood ejected by each ventricle in single systole; Normal Value = 70 ml/beat
Stroke Volume = End diastolic Volume – End Systolic Volume
So stroke volume is mainly controlled by
EDV
ESV
VENOUS RETURN: What ever blood volume returns to the heart, same is pumped forward through the Frank’s Starlings Law. According to this law 13- 15 liters of blood volume can be pumped out without cardiac stimulation.
DURATION OF DIASTOLE OR FILLING TIME: ventricular filling occurs during diastole, so there must be adequate ventricular filling time.
DISTENSIBILITY OF THE VENTRICLES: Normally ventricles are distensible to accommodate adequate blood volume. Infarction decreases the distensibility which decreases the EDV.
ATRIAL CONTRACTION: There must be adequate atrial contraction to have adequate EDV. If atrial function is not adequate then EDV will decrease.
E.S.V is basically CONTROLLED BY MYOCARDIAL CONTRACTION
FORCE OF MYOCARDIAL CONTRACTION: It depends upon the initial length of muscle fibers according to frank’s starlings law.
PRELOAD: The effect of EDV on initial length is called preload. So EDV also effects the ESV.
AFTER LOAD: Force of contraction is also dependant upon the resistance against which the ventricles have to pump
CONDITION OF THE MYOCARDIUM : It also effects the force of contraction.
AUTONOMIC NERVES : Sympathetic stimulation increases and parasympathetic stimulation decreases force of contraction
HORMONES: Catecholamines, thyroxine, glucagon, digitalis, calcium, increased temp, caffeine, theophyline increase the force.
Force decreases by hypoxia, acidosis, barniturates, procainamide and quinidine decrease the force of contraction.
HEART RATE
REGULATION OF HEART RATE
VASOMOTOR CENTER – CARDIAC CENTER
MOTOR (EFFERENT) NERVE FIBERS TO HEART
FACTORS AFFECTING VASOMOTOR CENTER
for all medical & health care students
Cardiac cycle refers to a complete heartbeat from its generation to the beginning of the next beat.
Cardiac events that occur from –
beginning of one heart beat to the beginning of the next are called the cardiac cycle.
“Cardiac output refers to the volume of blood pumped out per ventricle per minute.”
Cardiac output is the function of heart rate and stroke volume.
STROKE VOLUME:
The amount of blood pumped by the left ventricle in one compression is called the stroke volume.
Heart Rate
The cardiac output increases with the increase in heart rate.
This presentation is an overview of the description of the 4 stages of the cardiac cycle (atrial diastole, atrial systole, ventricular systole, ventricular diastole) as well as explaining the mechanism of the cardiac cycle.
HEART RATE
REGULATION OF HEART RATE
VASOMOTOR CENTER – CARDIAC CENTER
MOTOR (EFFERENT) NERVE FIBERS TO HEART
FACTORS AFFECTING VASOMOTOR CENTER
for all medical & health care students
Cardiac cycle refers to a complete heartbeat from its generation to the beginning of the next beat.
Cardiac events that occur from –
beginning of one heart beat to the beginning of the next are called the cardiac cycle.
“Cardiac output refers to the volume of blood pumped out per ventricle per minute.”
Cardiac output is the function of heart rate and stroke volume.
STROKE VOLUME:
The amount of blood pumped by the left ventricle in one compression is called the stroke volume.
Heart Rate
The cardiac output increases with the increase in heart rate.
This presentation is an overview of the description of the 4 stages of the cardiac cycle (atrial diastole, atrial systole, ventricular systole, ventricular diastole) as well as explaining the mechanism of the cardiac cycle.
CVS in exercise - SPORTS PHYSIOLOGY
Cardiovascular system and the influence of exercises on it The effects of exercise on cardiovascular system can be determined it by :-
1. The effect on heart size,
2. The effect on plasma volume ,
3. The effect on stroke volume,
4. The effect on heart rate ,
5. The effect on cardiac output ,
6. The effect on oxygen extraction ,
7. The effect on blood flow and distribution
8. The effect on blood pressure
Cardiac output by Dr. Amruta Nitin Kumbhar Assistant Professor, Dept. of Phys...Physiology Dept
Definition of cardiac output and related terms
Measurement of cardiac output
Variations in cardiac output
Regulation of cardiac output
Cardiac output control mechanisms
Role of heart rate in control of cardiac output
Integrated control of cardiac output
Heart–lung preparation
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
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
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
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
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
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.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
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. Cardiac Output
Cardiac output is the quantity of blood pumped into the aorta each minute by
the heart.
Unit – liter (ml) / min.
CO = SV multiplied by Heart Rate (HR) or Pulse Rate (PR)
Cardiac Output = Arterial Pressure / Total Peripheral Resistance
Cardiac output varies widely with the level of activity of the body.
The following factors directly affect cardiac output:
(1) The basic level of body metabolism,
(2) Whether the person is exercising or not,
(3) The person's age, and
(4) Size of the body.
3. Stroke Volume
Stroke volume ( SV ) is the volume of blood pumped from one ventricle of
the heart with each beat.
Unit of SV measurement is ml / beat.
SV is calculated using measurements of ventricle volumes from
an echocardiogram and subtracting the volume of the blood in the ventricle at the
end of a beat ( called end - systolic volume ) from the volume of blood just prior to
the beat ( called end - diastolic volume ).
SV = EDV – ESV
The term stroke volume can apply to each of the two ventricles of the
heart, although it usually refers to the left ventricle.
The stroke volumes for each ventricle are generally equal, both being approximately
70 ml in a healthy 70 kg man. Stroke volume is an important determinant of cardiac
output, which is the product of stroke volume and heart rate
4. Stroke Volume
When the heart contracts strongly, the end - systolic volume can be decreased
to as little as 10 to 20 millilitres.
Conversely, when large amounts of blood flow into the ventricles during
diastole, the ventricular end - diastolic volumes can become as great as 150 to
180 millilitres in the healthy heart.
By both increasing the end - diastolic volume and decreasing the end - systolic
volume, the stroke volume output can be increased to more than double
normal.
Men, on average, have higher stroke volumes than women due to the larger size
of their hearts.
However, stroke volume depends on several factors such as contractility,
duration of contraction, preload (end - diastolic volume) and after load.
5. Stroke Volume
Prolonged aerobic exercise training may also increase stroke volume, which
frequently results in a lower (resting) heart rate.
Reduced heart rate prolongs ventricular diastole (filling), increasing enddiastolic volume, and ultimately allowing more blood to be ejected
(cardiovascular conditioning in athletes).
Stroke volume is intrinsically controlled by preload (the degree to which the
ventricles are stretched prior to contracting). An increase in the volume or
speed of venous return will increase preload and, through the Frank – Starling
law of the heart, will increase stroke volume.
Elevated after load (commonly measured as the aortic pressure during systole)
reduces stroke volume. Though not usually affecting stroke volume in healthy
individuals, increased after load will hinder the ventricles in ejecting blood,
causing reduced stroke volume.
6. Stroke Volume
The resistance to the ejection of blood by the ventricle is called afterload.
The left ventricle, for example, must create sufficient pressures during systole to
overcome diastolic arterial pressure and systemic vascular resistance before any
blood is ejected.
While preload enhances contractility and stroke volume, high pressures in the
arterial vessels during ventricular end diastole is inversely related to stroke
volume.
While systemic vascular resistance is not easily determined without a
pulmonary artery catheter, diastolic blood pressure is easily measured.
So while an accurate estimate of afterload is often not clinically practical, a
patient’s diastolic pressure provides a good indication of the resistance the left
ventricle must overcome.
In general, the higher the diastolic pressure, the higher the afterload.
7. Stroke Volume
Afterload is also tied to cardiac hypertrophy.
As the resistance to chamber contraction increases, the chamber
adapts to this increased workload with the accumulation of
increased fiber within the myocardial cells.
This makes the cells stronger but also bulks up the cells, ultimately
resulting in chamber hypertrophy.
Unfortunately, these thicker chamber walls can be associated with
additional complications such as decreased contractility, reduced
stroke volume, and cardiac dysrhythmias.
8. Cardiac Output
For young, healthy men, resting cardiac output averages about 5.6 L / min.
For women, this value is about 4.9 L / min.
With increasing age, body activity diminishes; the average cardiac output for the
resting adult is often stated to be almost exactly 5 L / min.
Experiments have shown that the cardiac output increases approximately in
proportion to the surface area of the body.
Therefore, cardiac output is frequently stated in terms of the cardiac index,
which is the cardiac output per square meter of body surface area.
The normal human being weighing 70 kilograms has a body surface area of
about 1.7 square meters, which means that the normal average cardiac index
for adults is about 3 L/min/m2 of body surface area.
9. Cardiac Output
Cardiac output is regulated throughout life almost directly in proportion to the
overall bodily metabolic activity. Therefore, the declining cardiac index is
indicative of declining activity with age.
10. Cardiac Output
Frank - Starling law of the heart states that when there is increased
quantities of blood flow (venous return – pre load) into the
heart, the cardiac muscle contracts with increased force, and this
empties the extra blood that has entered from the systemic
circulation. And so there is increased cardiac output.
The venous return to the heart is the sum of all the local blood
flows through all the individual tissue segments of the peripheral
circulation. Therefore, it follows that cardiac output regulation is
the sum of all the local blood flow regulations.
When the total peripheral resistance (after load) increases above
normal, the cardiac output falls; conversely, when the total
peripheral resistance decreases, the cardiac output increases.
11. Cardiac Output
Two types of factors usually can make the heart a better pump
than normal.
(1) Nervous stimulation: Increased sympathetic & inhibited
parasympathetic activity leads to both increased heart rate &
strength of heart contraction leading to increased cardiac
output.
(2) Hypertrophy of the heart muscle: A long-term increased
workload, but not so much excess load that it damages the
heart, causes the heart muscle to increase in mass and
contractile strength in the same way that heavy exercise causes
skeletal muscles to hypertrophy leading to increased cardiac
output.
12. Cardiac Output
Low cardiac output, whether it be a peripheral factor or a cardiac
factor, if ever the cardiac output falls below that level required for
adequate nutrition of the tissues, the person is said to suffer
circulatory shock.
Cardiac index is calculated mainly in this type of patient for early
detection of shock.
In the human, except in rare instances, cardiac output is measured
by indirect methods that do not require surgery.
Two of the methods commonly used are the oxygen Fick’s method
and the indicator dilution method.
13. Cardiac Output
Why cardiac output is vital to our well-being ?
Simply, cardiac output is intimately connected to energy
production.
Sufficient perfusion to the tissues yields an abundant energy
supply.
Poor tissue perfusion results in critical shortages of energy and
often diminished function.
Sufficient cardiac output is necessary to deliver adequate supplies
of oxygen and nutrients (glucose) to the tissues.
14. Table No. 1 : Example values in healthy 70 kg man
Measure
Typical value Normal range
End - diastolic volume ( EDV ) 120 ml
65 - 240 ml
End - systolic volume ( ESV )
50 ml
16 - 143 ml
Stroke volume ( SV )
70 ml
55 - 100 ml
Ejection fraction ( Ef )
65 %
55 to 70 %
Heart rate ( HR )
75 bpm
60 to 100 bpm
Cardiac output ( CO )
5.25 L / minute 4.0 - 8.0 L / min
Of the total CO, 75 % is distributed to the vital organs –
Liver, kidney, brain, lung, heart
15. Table No. 2 : Effect of various Physiologic
conditions on Cardiac Output
Condition or Factor
No
Sleep
change
Moderate changes in environmental
temperature
Increase
Anxiety and excitement ( 50 – 100 % )
Eating ( 30 % )
Exercise ( up to 700 % )
High environmental temperature
Pregnancy ( Later months )
Epinephrine
High Altitude due to hypoxia
Day time according to metabolic activity
Decrease Sitting or standing from lying position
( 20 – 30 % )
17. Factors regulating HR
Age, Sex
Body temp. – Marey’s law
Drugs – E, NE, Bainbridge reflex
Diseases:
↑ in ICP – bradycardia – Cushing reflex
Thyrotoxicosis
Hypoxia
Emotions, Exercise
Pain – superficial & deep, respiration – sinus arrhythmia
18. Factors controlling HR
Cardiac innervation by ANS
Medullary Cardiovascular centers: VMC, CVC
HR & Respiration – Role of inspiratory neurons
Role of baroreceptors – NTS – CVC, Resting vagal
tone
Role of chemoreceptors - hypoxia
19.
20. Pathway relating interaction of cardiac
and respiratory reflexes
I neurons
+
-
Chemoreceptors
+
Nucleus tractus
solitarius
Baroreceptor
+
Nucleus
ambiguus