Question

Which of the following is TRUE of NE?

Group of answer choices

it opens Na+ channels at the motor end plate of skeletal muscle

it reduces heart rate

it generally causes vasoconstriction

it increases digestive motility

it is secreted by somatic motor neurons

Answer 1

True statement about NE is option (c) It generally causes vasoconstriction.

Nor epinephrine or Nor adrenaline is a catecholamine which acts as a neurotransmitter and hormone.

Acting through α- and β-adrenergic receptors on blood vessels, it causes narrowing of vessels. Vessel narrowing is termed as vasoconstriction. Option (c) is correct.

Neurotransmitter which causes opening of Na+ channels at the motor end plate of skeletal muscle is acetyl choline. Option (a) is not correct.

Nor epinephrine increases heart rate . So option (b) is wrong.

NE decreases gastro intestinal motility. Option (d) is incorrect.

Neurotransmitter secreted by somatic Motor neurons is acetyl choline. Option (e) is also incorrect about NE.