This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Exchange of Gases”.
1. Which is true for carbon dioxide concentration?
a) More in alveolar air than in expired air
b) More in inspired air than in alveolar air
c) More in expired air than in alveolar air
d) More in alveolar air than in inspired air
View Answer
Explanation: Carbon dioxide concentration is more in alveolar air than in expired air. Carbon dioxide is expelled out from the body.
2. One molecule of hemoglobin carries ___________ molecules of oxygen.
a) 4
b) 3
c) 2
d) 1
View Answer
Explanation: Hemoglobin is a protein molecule found in RBC. It is made u of 4 sub units. They are 2 alpha subunits and 2 beta subunits. 1 molecule of hemoglobin can bind to 4oxygen molecules.
3. Maximum amount of oxygen is exchanged from blood in ___________
a) Arteries of the body
b) Capillaries surrounding the alveoli
c) Left auricle of the heart
d) Arteries of the body
View Answer
Explanation: Maximum amount of oxygen is exchanged from blood in Capillaries surrounding the alveoli.
4. Residual volume is _______________
a) Lesser than tidal volume
b) Greater than vital capacity
c) Greater than inspiratory volume
d) Greater than tidal volume
View Answer
Explanation: The volume of air still remaining in the lungs after the most forcible expiration possible is called residual air. It is about60-100cubic inches.
5. Oxygen dissociation curve is _________
a) Parabolic
b) Hyperbolic
c) Sigmoid
d) Straight
View Answer
Explanation: Oxygen dissociation curve is a curve that plots the proportion of hemoglobin in its saturated form in vertical axis against the prevailing oxygen tension on the horizontal axis. Oxygen dissociation curve is sigmoid.
6. RQ is one in case of ____________
a) Fatty acids
b) Nucleic acids
c) Organic acids
d) Carbohydrates
View Answer
Explanation: RQ of carbohydrate is one. Carbohydrate has the same 2:1 ratio of hydrogen to oxygen as water. Therefore its RQ is one.
7. Oxygen is mainly transported as ____________
a) Oxyhemoglobin
b) Hemo-oxyglobin
c) Hemoglobin
d) Oxynoglobin
View Answer
Explanation: Oxyhemoglobin is a bright red substance formed by the combination of hemoglobin with oxygen present in oxygenated blood.
8. ____________ ml of oxygen is transported per deciliter of blood.
a) 20ml
b) 40ml
c) 10ml
d) 50ml
View Answer
Explanation: About 20ml of oxygen is transported per deciliter of blood. It is transported as Oxyhemoglobin.
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