THORAX ABDOMEN AND PELVIS

MEDICAL

HEART AND PERICARDIUM

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which nervous system uses cardiac accelerator nerves to trigger the release of norepinephrine?

A	Parasympathetic
B	Sympathetic
C	Either A or B
D	None of the above

Explanation:

Detailed explanation-1: -The sympathetic nervous system releases norepinephrine (NE) while the parasympathetic nervous system releases acetylcholine (ACh). Sympathetic stimulation increases heart rate and myocardial contractility.

Detailed explanation-2: -After the amygdala sends a distress signal, the hypothalamus activates the sympathetic nervous system by sending signals through the autonomic nerves to the adrenal glands. These glands respond by pumping the hormone epinephrine (also known as adrenaline) into the bloodstream.

Detailed explanation-3: -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.

There is 1 question to complete.