Summary of digestive activities

Question 1

Haustral churning moves contents from

Answer 1

haustrum to haustrum by muscular contractions

Question 2

Peristalsis moves contents along length of

Answer 2

colon by contractions of circular and longitudinal
muscles

Question 3

Mass peristalsis forces contents into

Answer 3

sigmoid colon and rectum.

Question 4

Defecation reflex eliminates

Answer 4

feces by contractions in sigmoid
colon and rectum

Question 5

Gastrin stimulus and site of secretion

Answer 5

Distension of stomach, partially
digested proteins and caffeine in
stomach, and high pH of stomach
chyme

Question 6

What is the major effects of gastrin

Answer 6

Promotes secretion
of gastric juice, increases gastric
motility, promotes growth of
gastric mucosa.

Question 7

Secretin stimulus and site of secretion

Answer 7

Acidic (high H+level) chyme that enters small intestine

Question 8

Cholecystokinin
(CCK) stimulus and site of secretion

Answer 8

Partially digested proteins (amino acids), triglycerides, and fatty acids that enter small
intestine

Question 9

Major effects of CCK

Answer 9

Stimulates secretion of pancreatic juice rich in digestive enzymes, causes ejection of bile from gallbladder and opening of sphincter of the
hepatopancreatic ampulla, induces satiety (feeling full to satisfaction).