Which two of the following changes usually tend to occur in the plain dwellers when they move into high altitudes?1. Increase in RBCs size2. Increase in RBC production3. Increased breathing rate4. Increased thrombocyte count

BODY FLUIDS AND CIRCULATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which two of the following changes usually tend to occur in the plain dwellers when they move into high altitudes?1. Increase in RBC’s size2. Increase in RBC production3. Increased breathing rate4. Increased thrombocyte count

A	1 & 4
B	1 & 2
C	2 & 3
D	3 & 4

Explanation:

Detailed explanation-1: -The plain dwellers when move to the higher altitudes certain physiological changes occur in order to cope up with decreased oxygen levels. The important changes are increased breathing rate, increased red blood cells productions with a decreased oxygen binding capacity.

Detailed explanation-2: -When a person living on the plains move to higher altitude, the breathing rate increases in response to lower concentrations of oxygen in the blood. This causes more oxygen to be delivered to the alveoli.

Detailed explanation-3: -In addition, the rate of miscarriages is usually higher at altitudes above two miles because fetuses receive less oxygen from their mothers. On returning to sea level after successful acclimatization to high altitude, the body usually has more red blood cells and greater lung expansion capability than needed.

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NEET BIOLOGY

HUMAN PHYSIOLOGY

BODY FLUIDS AND CIRCULATION