This set of Human Physiology Questions and Answers for Aptitude test 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
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.
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
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
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 _________
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 horizontal axis. Oxygen dissociation curve is sigmoid.
6. RQ is one in case of ____________
a) Fatty acids
b) Nucleic acids
c) Organic acids
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 ____________
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.
Explanation: About 20ml of oxygen is transported per deciliter of blood. It is transported as Oxyhemoglobin.
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To practice all areas of Human Physiology for Aptitude test, here is complete set of 1000+ Multiple Choice Questions and Answers.