NEET UG BIOLOGY MCQ: BREATHING AND EXCHANGE OF GASES

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Which two of the following changes (I-IV) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
I. Increase in red blood cell size.
II. Increase in red blood cell production.
III. Increased breathing rate.
IV. Increase in thrombocyte count.
Changes occurring are

View answer and explanation

Correct option: A

I and III

Option A (I and III) is correct because high altitudes lead to increased red blood cell production and breathing rate to compensate for lower oxygen availability.

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