First slide

Transport of Gases

Question

In a hypothermic patient whose body temperature is 34°C,

Difficult

A

Metabolic rate is higher than in a normal healthy man
B

Oxygen-haemoglobin dissociation curve is shifted rightward
C

Vasodilation of peripheral blood vessels occurs to avoid heat loss
D

Oxygen-haemoglobin dissociation curve is shifted leftward

Solution

The normal body temperature in human beings is $37^{0}$ C. Lower temperature favours the formation of oxyhaemoglobin and shifts the oxygen dissociation curve to the left. At lower temperatures, the metabolic rate would be low. Peripheral blood vessels constrict (not dilate) to avoid heat loss.

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