Question

Please explain the regulation of cardiac activities

Answer 1

Hi.

here is your answer. ..

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Normal activities of the heart are regulated by specialised muscle ( Auto regulated ), hence the heart is called myogenic .

The cardiovascular centre lies in the medulla oblengata of the brain. sino auricular node receive sympathetic & para symphatic nerves which secrets adernaline and acetylcholine respectively.

Adrenaline stimulate and increase heart beat whereas acetylcholine decrease the heart rate.

During inspiration heart rate increases and expiration it falls.

This phenomenon is known as sinus arrhythminas.


hope it helps you ☺

Answer 2

hello friend...

normal cardiac activities are regulated by a specialised cell present in the left atrium of heart known as SAN ( Sinu Auricular Node ) which refers it as myogenic heart.
SAN generates impulse and transmits to the different parts of heart through AVN, Bundle of His and Purkinje fibres.
sometimes heart rate is also regulated by medula oblangata of ANS. sympathetic nerves of ANS gives stimulus which leads to stronger ventricular and atrial contraction which increases the cardiac output.

hope it will help you...
best of luck...