NEET BIOLOGY

Detailed explanation-1: -Medulla oblongata is the centre of heart beat regulation in the brain. Neural signals through sympathetic nerves can increase the rate of heartbeat and through parasympathetic nerves, the rate of heart beat can be decreased. Both these nerves are a part of the autonomic nervous system (ANS).

Detailed explanation-2: -The sympathetic nervous system (SNS) releases the hormones (catecholamines-epinephrine and norepinephrine) to accelerate the heart rate. The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate.

Detailed explanation-3: -A special neural center in the medulla oblongata can moderate the cardiac function through the autonomic nervous function ( ANS) .

Detailed explanation-4: -Regulation of the Cardiac Cycle – controlled by the cardiac center within the medulla oblongata. The cardiac center signals heart to increase or decrease its rate according to many factors that the brain constantly monitors.

Detailed explanation-5: -Solution : The regulation of cardiac activity is under the control of nerves control and endocrine control. <br> Normal activities of the heart are regulated intrinsically i.e auto regulated by specialised muscles (nodal tissue). <br> Nodal tissue possesses qualities of both muscles and nerves.