Class 3 - Neurotransmitters & Receptors

Question 1

Which ANS neurons are cholinergic?

Answer 1

• all sympathetic and parasympathetic preganglionic, and parasympathetic postganglionic
• sympathetic postganglionic to most sweat glands

Question 2

Nicotinic receptors are found in….

Answer 2

chromaffin cells
motor end plate of NMJ
plasma membrane of dendrites and cell bodies of SNS & PNS postganglionic neurons (receiving end, not transmitting end)

Question 3

3 locations muscarinic receptors are found:

Answer 3

smooth muscle
cardiac muscle
glands

Question 4

Nicotinic receptor stimulation ONLY results in __ of the postsynaptic cell

Answer 4

excitation

Question 5

Skeletal muscle fibres contain ___ receptors

Answer 5

nicotinic (ACh)

Question 6

T/F: muscarinic receptor stimulation may cause excitation OR inhibition.

Answer 6

T

Question 7

When NE is released from chromaffin cells, it’s considered a ___

Answer 7

hormone

Question 8

Alpha 1 & Beta 1 receptor stimulation will cause __ of effector tissues

Answer 8

excitation

Question 9

Alpha 2 & Beta 2 receptor stimulation will cause __ of effector tissues

Answer 9

inhibition

Question 10

T/F: most cells contain both alpha and beta receptors.

Answer 10

FALSE, most contain either/or. Some visceral effectors have both.

Question 11

__ stimulates alpha receptors more strongly than beta receptors

Answer 11

NE

Question 12

T/F: Epinephrine is equally potent to both alpha and beta receptors.

Answer 12

true

Question 13

Sympathomimetic drugs have what function?

Answer 13

mimic sympathetic NS functions

Question 14

Propranolol treats HBP by…

Answer 14

blocking beta receptors to prevent their activation by NE and E