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Q.

Which of the following features increases the rate of heartbeat in humans?

(i) Parasympathetic signal       (ii) Catecholamine stimulus

(iii) More CO2 in blood           (iv) Thyroxine under secretion

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a

Only (ii)

b

(ii) and (iii)

c

(i) and (ii)

d

(iii) and (iv)

answer is C.

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Detailed Solution

Rate of heartbeat increases due to stimulus from catecholamines or more CO2 in blood which stimulates chemoreceptors.

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