L2: Intro to GI physiology

Question 1

Put the following digestive functions in order:
Absorption
Secretion
Digestion
Ingestion
Mechanical processing
Excretion

Answer 1

1) Ingestion
2) Mechanical processing
3) Digestion
4) Secretion
5) Absorption
6) Excretion

Question 2

What do tight junctions do?

Answer 2

Prevent diffusion of plasma membran proteins between apical/basolateral domains

Question 3

Is the apical membrane or basolateral membrane in contact with the external compartment of the plasma membrane?

Answer 3

Apical membrane

Question 4

In what direction does the movement of solute take place in transepithelial movement?

Answer 4

Uni-directional

Question 5

Which two routes can absorption take place from lumen to blood?

Answer 5

1) Transcellular = via cells

2) Paracellular = in between cells

Question 6

What’s the difference between primary and secondary active transport?

Answer 6

Primary uses energy directly from ATP to drive transport

Secondary uses electrochemical gradient set up by primary active transport

Question 7

Where does the main sensory and motor control of GI activity come from?

Answer 7

Parasympathetic nerves

Question 8

What controls the foregut and midgut innervation?

Answer 8

Vagus

Question 9

What controls the hindgut innervation?

Answer 9

Pelvic splanchnic nerves

Question 10

What effect does the sympathetic nervous system have on on gut activity?

Answer 10

Inhibitory