Digestive System

Question 1

What are the 4 main processes involved in the digestive system?

Answer 1

1. Digestion
2. absorption
3. Motility
4. Secretion

Question 2

What are the 4 layers of the GI tract?

Answer 2

1. Mucosa
2. Submucosa
3. Muscularis externa
4. Serosa

Question 3

What are the four main stages of GI function?

Answer 3

1. Cephalic phase
2. Swallowing (deglutition)
3. Gastric phase
4. intestinal phase

Question 4

Digestive processes are separated into what?

Answer 4

• digestion and absorption
• motility
• secretion

Question 5

Define Peristalsis?

Answer 5

progressive waves of contraction that move from one section of the GI tract to the next

Question 6

Define segmental contraction?

Answer 6

mixes intestinal contents & ensures contact with absorptive epithelium

Question 7

What are the 3 types of reflexes?

Answer 7

1. Long reflexes
2. Short reflexes
3. Reflexes involving GI peptides

Question 8

What are the 3 main groups of GI hormones?

Answer 8

1. The gastrin family
2. secretin family
3. everything else (motilin)