Heart beat is accelerated by

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The heart rate is regulated by the autonomic nervous system and endocrine hormones.$1$. The sympathetic nervous system increases the heart rate by

Vedclass · Accepted Answer

Sympathetic nerves and nor epinephrine

Vedclass · Answer

(D) The heart rate is regulated by the autonomic nervous system and endocrine hormones.$1$. The sympathetic nervous system increases the heart rate by releasing neurotransmitters that stimulate the sinoatrial node.$2$. Adrenaline (epinephrine) and noradrenaline (norepinephrine),secreted by the adrenal medulla,also increase the heart rate and cardiac output during stress or 'fight-or-flight' responses.$3$. Conversely,the parasympathetic nervous system and acetylcholine decrease the heart rate.Therefore,sympathetic nerves and nor epinephrine are responsible for accelerating the heart beat.

Similar Questions

$A$ 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 happens to the heart of a frog when the vagus nerve is stimulated?

Assertion $(A) :-$ Parasympathetic neural signals decrease the cardiac output.
Reason $(R) :-$ Parasympathetic neural signals decrease the rate of heartbeat and the speed of conduction of action potentials.

Innervation of heart in the intact animals is primarily meant for

Vedclass Test Series

Exam Paper Generator

Online Exam Module