VI- Esophageal and Gastric Motility

Question 1

primary peristalsis

Answer 1

vagovagal regulation
-mechanoreceptors sense bolus,
-vagal efferent branches

Question 2

secondary peristalsis

Answer 2

protective vs acid
-mediated by ENS
-stimulated by low pH or distension from bolus
-contractions upstream and relaxes downstream

Question 3

antral systole

Answer 3

process of churning in the stomach
-contents are moved retropulsively against closed pylorous so smashed

Question 4

emptying of stomach

Answer 4

delivery of food to duodenum depends on contents so
-glucose fastest
-proteins and lipids slow down

Question 5

parts of storing in stomach

Answer 5

1. receptive relaxation- stim by swallowing in anticipation of food, reg by vagovagal
2. gastric accomodation - stim by gastric duodenal filling or stretch, reg by ENS

Question 6

neurotransmitters in emetic resp

Answer 6

1. 5-HT aka serotonin
2. Ach
3. dopamine
4. histamine

Question 7

causes of emetic resp

Answer 7

1. meds
2. GI disorders
3. CNS resp
4. endocrine
5. infection