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Which two of the following changes (a–d) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
(a) Increase in red blood cell size
(b) Increase in red blood cell production
(c) Increased breathing rate
(d) Increase in thrombocyte count
Changes occurring are
(a) Increase in red blood cell size
(b) Increase in red blood cell production
(c) Increased breathing rate
(d) Increase in thrombocyte count
Changes occurring are
A
(a) and (b)
B
(b) and (c)
C
(c) and (d)
D
(a) and (d)
Detailed Solution
At high altitude the atmospheric pressure is low, so the body does not get enough oxygen and the person may suffer from altitude sickness (nausea, fatigue, heart palpitations).
The body gradually gets acclimatised and compensates for the low oxygen availability by: increasing red blood cell production, decreasing the binding affinity of haemoglobin, and increasing the breathing rate.
So (b) and (c) occur.
The size of red blood cells and the thrombocyte (platelet) count are not part of this response, so (a) and (d) do not occur.
Hence the changes are (b) and (c).
The body gradually gets acclimatised and compensates for the low oxygen availability by: increasing red blood cell production, decreasing the binding affinity of haemoglobin, and increasing the breathing rate.
So (b) and (c) occur.
The size of red blood cells and the thrombocyte (platelet) count are not part of this response, so (a) and (d) do not occur.
Hence the changes are (b) and (c).