Receptors

Question 0

What are muscarinic receptors?

Answer 0

A type of cholinergic receptor (acetylcholine).
Found at some sympathetic innervations - sweat glands and erector pili.
Vagus nerve is muscarinic.
All cholinergic receptors except for ganglia, adrenal glands and neuromuscular junctions are muscarinic.

Question 1

What are nicotinic receptors?

Answer 1

A type of cholinergic receptor (acetylcholine).

Found at ganglia, neuromuscular junctions and the adrenal glands.

Question 2

What do alpha-1 receptors do?

Answer 2

A type of adrenergic receptor (norepinephrine).
Vasoconstriction at skin and guts.
Pupil constriction.
GI and bladder sphincter constriction.

Question 3

What do alpha-2 receptors do?

Answer 3

A type of adrenergic receptor (norepinephrine).
Relax GI muscles.
Decrease sympathetic stimulus to the heart.

Question 4

What do beta-1 receptors do?

Answer 4

A type of adrenergic receptor (norepinephrine).

Increase heart rate and contractility.

Question 5

What do beta-2 receptors do?

Answer 5

A type of adrenergic receptor (norepinephrine). 
Vasodilation of skeletal muscles. 
Bronchodilation. 
Uterine relaxation. 
Increase gluconeogenesis.