gneet

Study Companion

For more NEET and AIIMS mcq on Breathing and respiration Visit www.gneet.com
QUESTION
Q30) Which two of the following changes ( a- d) usually tend to occur in plain dwellers when they move to higher altitudes ( 3500 m or more)
(a) Increase in red blood cell size.
(b) Increase in red blood cell production.
(c) Increase in breathing rate .
(d) Increase in thrombocyte count

Try again

Try again

Try again

correct

The air is "thinner" at high altitudes meaning there are fewer oxygen molecules per volume of air or partial pressure of oxygen is less. To compensate for the decrease in oxygen, one of the body's hormones, erythropoietin (EPO), triggers the production of more red blood cells to aid in oxygen delivery to the musclesand increases the breathing rate


Answer : (d)