MEDICAL PHYSIOLOGY

Detailed explanation-1: -Epinephrine is the principal hormone secreted by the adrenal medulla, although it also releases some norepinephrine. The rate of secretion of catecholamines by the adrenal medulla is largely regulated by the same mechanisms that control sympathetic nervous activity.

Detailed explanation-2: -Epinephrine, also known as adrenaline, is both a neurotransmitter and a hormone. It plays an important role in your body’s “fight-or-flight” response.

Detailed explanation-3: -Your sympathetic nervous system uses chemicals called neurotransmitters to communicate. Specifically, these chemicals are norepinephrine, epinephrine and acetylcholine.

Detailed explanation-4: -Norepinephrine or noradrenaline–A substance that is both a hormone and neurotransmitter. It is secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause constriction of blood vessels and increases in heart rate, blood pressure, and the sugar level of the blood.

Detailed explanation-5: -The sympathetic nervous system (SNS) of the CNS that is involved when a stressor is encountered is the SNS stimulation of the adrenal glands, which, releases the catecholamines epinephrine (adrenaline) and norepinephrine (noradrenaline).