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Decrease in the rate of heart beat, spee...

Decrease in the rate of heart beat, speed of conduction of action potential and thereby the cardiac output is under the control of

A

Neural signals through the sympathetic nerves

B

Neural signals through the parasymphathetic nerves

C

Adrenaline

D

ANS

Text Solution

Verified by Experts

The correct Answer is:
B
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Which of the following generates the action potential in the heart ?

Go through the following statements (i) Vagus nerve decreases the rate of impulse formation from the SA node and its conduction (ii) As the human heart is myogenic in nature, the rate of formation and conduction of cariac impulse cannot be changed by the action of nerves (iii) The end of T-wave in ECG marks the end of systole. (iv) If the P-wave in ECG is inverted , it indicates that SA node fails to initiate impulse and the atrial muscle depolarises by the impulse originating in A.V. node. Whic of these are correct ?

P.Normal activities of the heart are regulated extrinsically i. e auto regulated by specialized muscles. Q. A special neural center in the medulla oblongata can moderate the cardiac function through the autonomic nervous function ( ANS) . R. Parasympathetic mental signals decrease the rate of heartbeat. S. Adrenal medullary hormones increase cardiac output. How many of the given statements are incorrect about the regulation of cardiac activities ?

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