When a normal man's heart is injected with a | vedclass

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(C) Adrenaline (epinephrine) is a hormone secreted by the adrenal medulla that acts as a neurotransmitter and hormone to prepare the body for 'fight o

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Sustained increased rate

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(C) Adrenaline (epinephrine) is a hormone secreted by the adrenal medulla that acts as a neurotransmitter and hormone to prepare the body for 'fight or flight' responses.When injected in physiological concentrations,adrenaline acts on the $\beta_1$-adrenergic receptors present in the heart.This stimulation leads to an increase in both the heart rate (positive chronotropic effect) and the force of contraction (positive inotropic effect).Therefore,the administration of adrenaline results in a sustained increased heart rate.

When a normal man's heart is injected with a physiological concentration of adrenaline,it causes:

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