GI Neurotransmitters

Question 1

Acetylcholine Source

Answer 1

Cholinergic Neurons

Question 2

Acetylcholine Actions

Answer 2

Smooth muscle contraction

Relaxation of sphincters
^salivary secretion
^gastric secretion
^pancreatic secretion

Question 3

Norepinephrine Source

Answer 3

Adrenergic neurons

Question 4

Norepinephrine Actions

Answer 4

Smooth muscle relaxation
Contraction of sphincters
Salivary secretion

Question 5

Vasoactive intestinal peptide (VIP) Source

Answer 5

Muscosal neurons

Question 6

Vasoactive intestinal peptide (VIP) Actions

Answer 6

Smooth muscle relaxation

^intestinal secretion

^pancreatic secretion

Question 7

Gastrin-Releasing Peptide (GRP) Source

Answer 7

Gastric neurons

Question 8

Gastrin-Releasing Peptide (GRP) Actions

Answer 8

^Gastrin secretion

Question 9

Enkephalins Source

Answer 9

Mucosal neurons

Question 10

Enkephalins Actions

Answer 10

Contraction of GI sphincters

Decrease intestinal secretion

Question 11

Substance P Source

Answer 11

Secreted with acetylcholine

Question 12

Neuropeptide Y Source

Answer 12

Mucosal neurons

Question 13

Neuropeptide Y Actions

Answer 13

Smooth muscle relaxation

Decrease intestinal secretion

Question 14

Substance P Actions

Answer 14

Smooth muscle contraction

^ Salivary secretion