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
(iii) and (iv)
c
(ii) and (iii)
d
(i) and (ii)
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.