Respiration | Transport of Carbon Dioxide in Blood & Body Fluids Part 2
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- Опубликовано: 27 авг 2024
- #drnajeeb #medicines #pharmacology #medicaleducation #drnajeeblectures #respiration
Respiration | Transport of Carbon Dioxide in Blood & Body Fluids Part 2
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(0:00-7:45)
Discussion of transport & partial pressure of Carbon Dioxide (CO2) in blood & body tissues.
Comparison of solubility of CO2 & Oxygen (O2) in blood & body tissues.
Discrepancy in amount of O2 going into (250ml) and CO2 coming out (200ml) of the body cells per minute; its explanation.
PCO2 in arterial and venous blood.
(7:46-14:34)
Total CO2 content in arterial and venous blood per deciliter [100ml]; difference equals amount of CO2 transported per deciliter.
Comparison of pO2 & pCO2 in arterial & venous blood.
Comparison of total O2 & CO2 content in arterial & venous blood.
(14:35-21:44)
Functions of Hb summarized:
1-O2 transport
2-CO2 transport
3-Function as Buffering Proteins; maintaining Acid Base balance/pH
4-Binding with Nitric Oxide (NO) arriving from the lungs; which helps in dilatation of small arterioles.
(21:45-32:10)
PERIPHERAL TISSUES:
RBCs carrying out most of CO2 transport from body tissues back to lungs; role of pCO2, protons (H+), bicarbonate (HCO3-), carbonic Acid (H2CO3) and CARBONIC ANHYDRASE enzyme (CA enzyme) inside RBCs.
Role of Bicarbonate-Chloride Exchanger/Band-3 protein in maintaining electrical balance inside the RBCs while they are transporting CO2; explanation of slight difference of Hematocrit values between venous & arterial blood in this context.
“Buffering function” of Hemoglobin (Hb) in maintaining acid-base balance within RBCs that are transporting CO2.
(32:11-37:10)
Transport of small amount of CO2 in dissolved form in the plasma.
Transport of small amount of CO2 as Carbamino-proteins; especially as CARBAMINOHEMOGLOBIN.
(37:11-41:15)
Summary of forms in which CO2 is transported:
1-90% as Bicarbonate ions; which are formed in RBCs but transported in plasma.
2-5% is in dissolved form; under pCO2 of 46mmHg
3-5% in form of Carbamino-compounds.
Explanation of BOHR’S EFFECT; role of protonated Hb & their reduced affinity for O2; effect on Oxygen-Hemoglobin Dissociation curve.
(41:16-54:12)
PULMONARY TISSUES:
Mechanism of release of dissolved CO2 and CO2 stored as Carbamino proteins into the pulmonary tissues.
Mechanism of release of CO2 transported as HCO3- into the pulmonary tissues; role of CA enzyme and Band-3 proteins inside RBCs in releasing CO2 into the alveoli.
Explanation of HALDANE EFFECT; as reverse of Bohr effect.
Comparison of Bohr effect and Haldane effect.
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