This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Transport of Respiratory Gases in Blood”.
1. Which of the following binds stronger to hemoglobin?
a) Oxygen
b) Carbon dioxide
c) Carbon monoxide
d) Carbon disulphide
View Answer
Explanation: Carbon monoxide has high affinity to hemoglobin. It is then followed by carbon dioxide and oxygen.
2. The factor which does not affect the rate of alveolar diffusion is __________
a) Solubility of gas
b) Reactivity of gas
c) Thickness of membrane
d) Concentration gradient
View Answer
Explanation: In the alveolar capillaries the diffusion of gases occurs. Oxygen diffuses from alveoli into blood and carbon dioxide from blood to alveoli. Alveolar diffusion does not depend on the reactivity of gas.
3. A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This oxygen ___________
a) helps in releasing more oxygen to tissues
b) raises the pCO2 of blood to 75mm of Hg
c) acts as a reserve during muscular exercise
d) is enough to keep oxyhemoglobin saturation at 96%
View Answer
Explanation: Some amount of oxygen is left unused in human blood and it acts as a reserve during muscular exercise and preventing muscle cramps.
4. The urge to inhale in humans results from _________
a) Rising Pco2
b) Rising O2
c) Falling PCO2
d) Falling PO2
View Answer
Explanation: The urge to inhale in humans results from rising of pco2. PcO2 refers to the partial pressure of carbon dioxide.
5. Blood analysis of a patient reveals an unusually high quantity of carboxyhemoglobin content. Which of the following conclusion is most likely to be correct? The patient has inhaled polluted air containing high amount of __________
a) Carbon dioxide
b) Chloroform
c) Carbon monoxide
d) Carbon disulphide
View Answer
Explanation: Carbon monoxide is colorless odorless and tasteless gas. It is toxic in nature. When blood is associated with carbon monoxide the carboxyhemoglobin content increases in the blood.
6. Which of the following is true about hemoglobin?
a) Present in dissolved state in blood plasma in scorpion
b) Present in dissolved state in blood plasma in earthworm
c) It is a dipeptide and present in RBCs in blood worm
d) It is a dipeptide in mammals and present in RBCs
View Answer
Explanation: Earthworm has closed circulatory system. It breaths through moist skin. Their blood contains red hemoglobin which is dissolved in blood plasma to transport oxygen.
7. RBCs and adipose tissue cells respire anaerobically because they ________
a) posses very few mitochondria
b) posses carbonic anhydrase
c) posses large amount of energy
d) posses less energy
View Answer
Explanation: RBCs and adipose tissue cells respire anaerobically. They do not need oxygen to respire as they have very few mitochondria present in them.
8. Lack of oxygen to the brain can make the person feel ___________
a) hyperactive
b) sleepy
c) depressed
d) gasping for air
View Answer
Explanation: Reduced supply of oxygen to the brain is called cerebral hypoxia. Prolonged hypoxia induces neurons cell death via apoptosis.
9. Oxygen diffuses out of blood into tissues because __________
a) Oxygen concentration of tissue fluid is lower
b) Oxygen concentration of blood is lower
c) Carbon dioxide concentration of tissue fluid is lower
d) Carbon dioxide concentration of tissue fluid is higher
View Answer
Explanation: Oxygen diffuses out of the blood into tissues because the concentration of oxygen in tissue fluid is lower. The principle of osmosis is followed here.
Sanfoundry Global Education & Learning Series – Human Anatomy and Physiology.
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