lecture 6: transportaion of both gases need a hemoglobin and part of them are transported by plasma. if Hb is low the saturation of oxygen also low and leads a hypoxia, fatigue, dyspnea, etc. in other hand acidosis can occur.
Bohr’s effect- The Bohr effect is a physiological phenomenon first described by Danish physiological Christian Bohr, stating that the “oxygen binding affinity of hemoglobin is inversely related to the concentration of carbon dioxide and hydrogen ion.
#An increase in blood CO2 concentration which leads to decrease in blood pH will results in hemoglobin proteins releasing their oxygen load.
#One of the factor that Bohr discovered was pH. He found that if the pH is lower than the normal, then hemoglobin does not bind oxygen.
#And this effect of CO2 on oxygen dissociation curve is known as Bohr effect.
Haldane effect- The Haldane effect is first discovered by John Scott Haldane.
#The Haldane effect describe the phenomenon by which binding of oxygen to hemoglobin promotes the release of carbon dioxide.
#Haldane effect is the mirror image of Bohr effect.
#The decrease in carbon dioxide leads to increase in the pH, which result in hemoglobin picking up more oxygen.
#This is a helpful biochemical feature which facilitates exchange of carbon dioxide for oxygen in the pulmonary and peripheral circulations.
Once the oxygen diffuses across the alveoli, it enters the bloodstream and is transported to the tissues where it is unloaded, and carbon dioxide diffuses out of the blood and into the alveoli to be expelled from the body. Although gas exchange is a continuous process, the oxygen and carbon dioxide are transported by different mechanisms.
What You’ll Learn to Do
Describe how oxygen is bound to hemoglobin and transported to body tissues
Explain how carbon dioxide is transported from body tissues to the lungs
Transport of oxygen (the guyton and hall physiology)Maryam Fida
Supply of oxygen to tissues mainly involves two systems i.e. respiratory system and the cardiovascular system.
Supply of oxygen to tissues depends upon
Adequate PO2 in atmospheric air
Adequate pulmonary ventilation
Adequate gaseous exchange in the lungs
Adequate uptake of oxygen by the blood
Adequate blood flow to the tissues
Adequate ability of the tissues to utilize oxygen
Oxygen diffuses from the alveoli into the pulmonary capillary blood because the oxygen partial pressure (Po2) in the alveoli is greater than the Po2 in the pulmonary capillary blood.
In the other tissues of the body, a higher Po2 in the capillary blood than in the tissues causes oxygen to diffuse into the surrounding cells.
The Po2 of the gaseous oxygen in the alveolus averages 104 mm Hg,
whereas the Po2 of the venous blood entering the pulmonary capillary at its arterial end averages only 40 mm Hg
Therefore, the initial pressure difference that causes oxygen to diffuse into the pulmonary capillary is 104 – 40, or 64 mm Hg.
About 98 percent of the blood that enters the left atrium from the lungs has just passed through the alveolar capillaries and has become oxygenated up to a Po2 of about 104 mm Hg.
Another 2 per cent of the blood which supplies mainly the deep tissues of the lungs and is not exposed to lung air. This blood flow is
called “shunt flow,” meaning that blood is shunted past the gas exchange areas
One gram of Hb can bind 1.34 ml of Oxygen
Normal level of Hb is 15 grams/dL
Thus 15 grams of hemoglobin in 100 milliliters of blood can combine with a total of almost exactly 20 milliliters of oxygen if the hemoglobin is 100 per cent saturated
This is usually expressed as 20 volumes per cent
Hemoglobin is a conjugated protein consisting of heme and globin.
The ferrous form can bind oxygen.
Hemoglobin molecule consists of four subunits each consists of one heme and one polypeptide chain
Each subunit can bind one molecule of Oxygen
Oxygenation is a very rapid and reversible process and it can occur in 0.01 seconds
When PO2 is high, oxygen binds with Hb to form Oxyhemoglbin
When PO2 is low oxygen leaves Hb to form Deoxy Hb.
Factors that shift the oxygen hemoglobin dissociation curve
Bohr’s effect- The Bohr effect is a physiological phenomenon first described by Danish physiological Christian Bohr, stating that the “oxygen binding affinity of hemoglobin is inversely related to the concentration of carbon dioxide and hydrogen ion.
#An increase in blood CO2 concentration which leads to decrease in blood pH will results in hemoglobin proteins releasing their oxygen load.
#One of the factor that Bohr discovered was pH. He found that if the pH is lower than the normal, then hemoglobin does not bind oxygen.
#And this effect of CO2 on oxygen dissociation curve is known as Bohr effect.
Haldane effect- The Haldane effect is first discovered by John Scott Haldane.
#The Haldane effect describe the phenomenon by which binding of oxygen to hemoglobin promotes the release of carbon dioxide.
#Haldane effect is the mirror image of Bohr effect.
#The decrease in carbon dioxide leads to increase in the pH, which result in hemoglobin picking up more oxygen.
#This is a helpful biochemical feature which facilitates exchange of carbon dioxide for oxygen in the pulmonary and peripheral circulations.
Once the oxygen diffuses across the alveoli, it enters the bloodstream and is transported to the tissues where it is unloaded, and carbon dioxide diffuses out of the blood and into the alveoli to be expelled from the body. Although gas exchange is a continuous process, the oxygen and carbon dioxide are transported by different mechanisms.
What You’ll Learn to Do
Describe how oxygen is bound to hemoglobin and transported to body tissues
Explain how carbon dioxide is transported from body tissues to the lungs
Transport of oxygen (the guyton and hall physiology)Maryam Fida
Supply of oxygen to tissues mainly involves two systems i.e. respiratory system and the cardiovascular system.
Supply of oxygen to tissues depends upon
Adequate PO2 in atmospheric air
Adequate pulmonary ventilation
Adequate gaseous exchange in the lungs
Adequate uptake of oxygen by the blood
Adequate blood flow to the tissues
Adequate ability of the tissues to utilize oxygen
Oxygen diffuses from the alveoli into the pulmonary capillary blood because the oxygen partial pressure (Po2) in the alveoli is greater than the Po2 in the pulmonary capillary blood.
In the other tissues of the body, a higher Po2 in the capillary blood than in the tissues causes oxygen to diffuse into the surrounding cells.
The Po2 of the gaseous oxygen in the alveolus averages 104 mm Hg,
whereas the Po2 of the venous blood entering the pulmonary capillary at its arterial end averages only 40 mm Hg
Therefore, the initial pressure difference that causes oxygen to diffuse into the pulmonary capillary is 104 – 40, or 64 mm Hg.
About 98 percent of the blood that enters the left atrium from the lungs has just passed through the alveolar capillaries and has become oxygenated up to a Po2 of about 104 mm Hg.
Another 2 per cent of the blood which supplies mainly the deep tissues of the lungs and is not exposed to lung air. This blood flow is
called “shunt flow,” meaning that blood is shunted past the gas exchange areas
One gram of Hb can bind 1.34 ml of Oxygen
Normal level of Hb is 15 grams/dL
Thus 15 grams of hemoglobin in 100 milliliters of blood can combine with a total of almost exactly 20 milliliters of oxygen if the hemoglobin is 100 per cent saturated
This is usually expressed as 20 volumes per cent
Hemoglobin is a conjugated protein consisting of heme and globin.
The ferrous form can bind oxygen.
Hemoglobin molecule consists of four subunits each consists of one heme and one polypeptide chain
Each subunit can bind one molecule of Oxygen
Oxygenation is a very rapid and reversible process and it can occur in 0.01 seconds
When PO2 is high, oxygen binds with Hb to form Oxyhemoglbin
When PO2 is low oxygen leaves Hb to form Deoxy Hb.
Factors that shift the oxygen hemoglobin dissociation curve
Introduction
Transport of O2 in the blood
Oxygen movement in the lungs and tissues
O2 dissociation curve
Bohr effect
Applied
Transport of CO2
The haldane effect
Chloride Shift or Hamburger Phenomenon
Reverse Chloride Shift
Common medication used for anesthesia, there action; dosage; adverse effect; duration of action.
They Include {inhalation + Induction + Muscle relaxant + Anticholinergic + Analgesic + Resuscitation}
in this presentation lecture we gone take a hypo and hyper thyrodism that affect the human cell because both situation may increase or decrease the basal metabolic rate.
When the pituitary Gland it' s function is increased whether the cause are?
Both anterior and Posterior gland secretions are increased the most causes are ADENOMAS
in this presentation you will be learn the different drug form that all medical health workers prescribing the medication.
the medical student should have a good knowledge and keep in mind these drug forms based on medical administration the drugs are classified into invasive (injection and transdermal implantation) and non invasive (oral, inhalers, suppository)
Medical equipment and tools are crucial to saving a person's life or performing any procedure.
i presented here the most and commonly equipment used by medical student to improve their skills
This note paper is short notes of general physiology for medical students who which to understand the concept of the physiology, physiology is the mother of medicine.
A summary of skeletal muscle contraction and relaxationAyub Abdi
it consist for 4 pages and cover all the steps that occur during muscle contraction and relaxation, I does not take a time just 5 minute is enough to read. I hope it's interesting.
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
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.
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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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
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
1. Transport of Oxygen and
Carbon Dioxide in Blood
and Tissue Fluids
20-10 -2019
2. • Blood serves to transport the respiratory
gases.
• Oxygen, which is essential for the cells is
transported from alveoli of lungs to the cells.
• Carbon dioxide, which is the waste product
in cells is transported from cells to lungs.
3. TRANSPORT OF OXYGEN :
• Oxygen is transported from alveoli to the
tissue by blood in two forms:
1. As simple physical solution (3%).
2. In combination with hemoglobin (97%).
4. 1- Simple Physical Solution:
• Oxygen dissolves in water of plasma.
• 0.3 mL/100 mL
• About 3% of total oxygen in blood.
• Poor solubility of oxygen in water content of
plasma.
• During the exercise this type of oxy transport
is used to meet the excess demand of oxygen
by the tissues.
5. 2- In Combination With
Hemoglobin:
• Oxygen combines with hemoglobin in blood.
• Transported as oxyhemoglobin.
• Maximum amount (97%).
Oxygenation of Hemoglobin
• Oxygen combines with hemoglobin.
• In the process of oxygenation and not
oxidation (does not change the ferrous of Hemoglobin).
• Oxygen can be readily released from hemoglobin when it
is needed.
6.
7. Oxygen Carrying Capacity of
Hemoglobin:
• Oxygen carrying capacity of hemoglobin is the amount
of oxygen transported by 1 gram of hemoglobin.
• It is 1.34 mL/g.
Oxygen Carrying Capacity of Blood:
• Oxygen carrying capacity of blood refers to the amount
of oxygen transported by blood.
• Normal hemoglobin content in blood is 15 g%.
• Since oxygen carrying capacity of hemoglobin is 1.34
mL/g, blood with 15 g% of hemoglobin should carry:
1.34 X 15 = 20.1 mL% of oxygen, i.e. 20.1 mL of oxygen
in 100 mL of blood.
9. Remember:
• Each Hb can carry 4 oxygen.
• One RBC contains 250 million Hb molecules, so
can carry 1 billion oxygen.
• 1g of Hb combine 1.34ml of Oxygen.
• 100ml of blood contains 15g of Hb, so
15g X 1.34ml/g = 20 ml of oxygen.
10. Saturation of Hemoglobin with
Oxygen:
• Saturation is the state or condition when
hemoglobin is unable to hold or carry any more
oxygen.
• Saturation of hemoglobin with oxygen depends
upon partial pressure of oxygen (a rise in PaO2 is
accompanied by a rise in the arterial oxygen
saturation).
• And it is explained by oxygen-hemoglobin
dissociation curve.
11. The number of occupied O2-
binding sites on the Hb molecule:
• 100% = 4 binding O2. – PO2 = 95 mm Hg
• 75% = 3 binding O2. – PO2 = 40 mmHg
• 50% = 2 binding O2. – PO2 = 25 -27 mmHg
• 25% = 1 binding O2. – PO2 = 15 mmHg
Effect of added hemoglobin
on oxygen distribution
between two compartments
containing a fixed number of
oxygen molecules and
separated by a
semipermeable membrane.
12. OXYGEN-HEMOGLOBIN
DISSOCIATION CURVE:
• Hemoglobin’s affinity for oxygen.
• Hemoglobin is saturated with oxygen only up to 95%.
• Under normal conditions, oxygen-hemoglobin
dissociation curve is ‘S’ shaped or sigmoid shaped.
• Lower part of the curve indicates dissociation of oxygen
from hemoglobin.
• Upper part of the curve indicates the uptake of oxygen by
hemoglobin depending upon partial pressure of oxygen.
13.
14. Factors Affecting Oxygen-hemoglobin
Dissociation Curve:
1. Shift to right:
indicates dissociation of oxygen from hemoglobin:
i. Decrease in partial pressure of oxygen.
ii. Increase in partial pressure of carbon dioxide
(Bohr effect).
iii. Increase in hydrogen ion concentration and
decrease in pH (acidity).
iv. Increased body temperature.
v. Excess of 2,3-diphosphoglycerate (DPG) in
RBC.
15. 2. Shift to left:
indicates acceptance (association) of
oxygen by hemoglobin
i. In fetal blood because, fetal hemoglobin has
got more affnity for oxygen than the adult
hemoglobin
ii. Decrease in hydrogen ion concentration and
increase in pH (alkalinity).
17. Bohr Effect:
• Is the effect by which presence of carbon
dioxide decreases the affinity of hemoglobin
for oxygen.
• By Christian Bohr in 1904.
• Due to continual metabolic activity in the
tissue there is high P co2 and Low P o2 in
tissue.
• Oxygen dissociation curve is shifted to right.
18. TRANSPORT OF CARBON DIOXIDE :
• Carbon dioxide is transported by the blood from cells
to the alveoli.
Carbon dioxide is transported in the blood in four
ways:
1. As dissolved form (7%)
2. As carbonic acid (negligible)
3. As bicarbonate (63%)
4. As carbamino compounds (30%).
19.
20. 1- AS DISSOLVED FORM:
• Carbon dioxide diffuses into blood and
dissolves in the fluid of plasma forming a
simple solution.
• Only about 3 mL/100 mL of plasma of carbon
dioxide is transported as dissolved state.
• It is about 7% of total carbon dioxide in the
blood.
21. 2- AS CARBONIC ACID
• Part of dissolved carbon dioxide in plasma
combines with the water to form carbonic
acid (H2CO3-).
• Transport of carbon dioxide in this form is
negligible.
22. 3- AS BICARBONATE
• About 63%.
• From plasma, CO2enters the RBCs.
• Then combine with water to form carbonic acid.
• The presence of carbonic anhydrase enzyme
accelerates the reaction.
• Carbonic anhydrase is present only inside the
RBCs and not in plasma.
• That is why carbonic acid formation is at least 200
to 300 times more in RBCs than in plasma.
23. Continueeee.
• Carbonic acid is very unstable.
• Dissociates into bicarbonate and hydrogen
ions.
• Concentration of bicarbonate ions in the cell
increases more and more.
• Due to high concentration, bicarbonate ions
diffuse through the cell membrane into
plasma.
24. 4- CARBAMINO COMPOUNDS
• About 30% of carbon dioxide is transported as
carbamino compounds.
• Carbon dioxide is transported in blood in
combination with hemoglobin and plasma
proteins.
• Carbon dioxide combines with hemoglobin to
form carbamino hemoglobin or carbhemoglobin.
• And it combines with plasma proteins to form
carbamino proteins.
• loose bond so that, carbon dioxide is easily
released into alveoli.
25. CARBON DIOXIDE DISSOCIATION
CURVE:
• Carbon dioxide dissociation curve is the curve
that demonstrates the relationship between
the partial pressure of carbon dioxide and the
quantity of carbon dioxide that combines with
blood.
28. Haldane Effect:
• Haldane effect is the effect by which
combination of oxygen with hemoglobin
displaces carbon dioxide from hemoglobin.
• It was first described by John Scott Haldane
in 1860.
• Excess of oxygen content in blood causes shift
of the carbon dioxide dissociation curve to
right.
29. • 1. Highly acidic hemoglobin has low tendency to
combine with carbon dioxide.
• So, carbon dioxide is displaced from blood.
• 2. Because of the acidity, hydrogen ions are
released in excess.
• Hydrogen ions bind with bicarbonate ions to form
carbonic acid.
• Carbonic acid in turn dissociates into water and
carbon dioxide.