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

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Question

(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:

Similar Questions

An increase in blood flow to the atria of the heart can cause the release of ............ and it causes ............ in blood vessels.

Heart rate is increased by all the following except:

Cardiac activities of the heart are regulated by:
$A.$ Nodal tissue
$B.$ $A$ special neural centre in the medulla oblongata
$C.$ Adrenal medullary hormones
$D.$ Adrenal cortical hormones
Choose the correct answer from the options given below:

When a normal heart is injected with a physiological concentration of adrenaline,it shows:

How do the signals from the parasympathetic nervous system affect the heart?

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