Lecture 37-38- Blood Flow and Motility

Question 1

What feature of GI cell walls allows for signal propagation

Answer 1

Gap juncitons

Question 2

What are Slow Waves

Answer 2

Changes in membrane potential, not contractions

Question 3

What are the pacemaker cells for the intestinal smooth muscle?

Answer 3

Interstitial Cells of Cajal (ICC)

Question 4

What stimulates the start of peristalsis?

Answer 4

Stomach distention

Question 5

Where do peristaltic movements become mixing contractions

Answer 5

Behind a sphincter

Question 6

What peptide opens the esophageal sphincter

Answer 6

VIP

Question 7

How many types of esophageal peristalsis

Answer 7

Two

Question 8

Which food qualities slow the gastric emptying rate?

Answer 8

Low pH, high osmolarity, high dietary fiber and fat

Question 9

How many hours for fecal material to go from chyme to feces?

Answer 9

8-15

Question 10

Why can eating initiate defecation

Answer 10

Mechanoreceptors in the stomach trigger mass movements in the colon

Question 11

Is the internal or external anal sphincter under voluntary control?

Answer 11

External

Question 12

Is the internal or external anal sphincter responsible for fecal continence?

Answer 12

Internal