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

Which of the following factors increase the heart rate?
$(A)$ Sympathetic nerve signals
$(B)$ Parasympathetic nerve signals
$(C)$ Adrenal medullary hormones
$(D)$ Vagus nerve
$(E)$ Thyroxine hormone
$(F)$ Acetylcholine

$A$ special neural centre that can moderate the cardiac function is located in

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:

What is the effect of the parasympathetic nervous system on the heart rate?

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