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]]>We have already studied, exchange of gases I previous article. in this article we will discuss transport of gases.
We know that blood is the medium through which the gases are transported between lungs and body tissues. When O2 and CO2 enters blood, certain chemical reactions occurs that facilitates the transport
Since O2 is not easily dissolved in blood plasma; only 1.5% of O2 is dissolved in blood plasma and the remaining oxygen binds with Hb of RBCs. The heme portion of hemoglobin contains 4 iron molecules which binds with 4 oxygen molecules in a easily reversible reaction to form oxyhemoglobin.
The factors that determine that how much oxygen is bind to the hemoglobin are as follows-
During a resting condition, approximately every 100ml of deoxygenated blood contain 53 ml of gaseous CO2. the CO2 is transported in three different forms-
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1. What acts as a carrier for the transport of gases from lungs to the tissue cells and vice-versa?
a. carbonate ion B. blood
C. hemoglobin d. partial pressure
2. which factor is considered as the most important factor to describe the affinity of oxygen towards hemoglobin?
A. partial pressure
of oxygen B. temp
C. Ph D. BPG
3. what do you mean by chloride shift?
A. movement of Cl ions from plasma to the RBCs
b. movement of HCO3- from plasma to the RBC
c. movement of Cl ion from RBC to the plasma
D. movement of HCO3- from RBC to the plasma
4. Match the following-
a) CO2 in dissolved form 1. No effect
B) in carbonate ions 2. 23% of CO2 in this form
C) as carbamino group 3. 70% of CO2 in this form
D) partial pressure of CO2 4. 7% of CO2
5. What happens to the oxyhemoglobin bond when the partial pressure of CO2 rises?
A. bond breaks easily in tissue B. bond is strong in tissue cells
C. no effect D. effect is not constant
6. In which form, the CO2 is transported?
A. dissolved form B. carbonate ions
C. carbamino compounds D. all of the above
7. Which of the following statement is true?
A. 1.5% of O2 is dissolved in blood plasma
B. the Po2 is higher in tissue cells, hence O2 comes out of Hb.
C. temp has no effect on oxygen transport
D. 70% of CO2 is transported as carbamino compounds
8. what happens when the concentration of BPG is higher in RBCs?
A. decreases the affinity B. increases affinity
C. no effect D. constant
9. What factors determine the CO2 transport?
A. temp b. Pco2
C. acidity D. none of the above
10. what is the effect of high temp on the oxygen affinity?
A. decreases affinity B. increases affinity
C. constant D. no constant effect
ANWERS:-
1. blood
2. partial pressure of oxygen
3. movement f Cl from plasma to RBC
4. a) – 4 b) – 3 c) – 2 d) – 1
5. bond break easily in tissue
6. all of the above
7. 1.5% of oxygen is dissolved in blood plasma
8. decreases the affinity in tissue cells
9. none of the above
10. decreases the affinity
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REFERENCE:-Gerard J. Tortora -Principles of anatomy and physiology; edition twelfth ; page no.-: 900-904.
The post Transport of Oxygen and Carbon-dioxide During External and Internal Respiration and MCQ appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
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