Lecture 27

Question 1

What is the main site for absorption

Answer 1

The small intestine

Question 2

Osmosis

Answer 2

Passive movement of water from lumen into the blood

Question 3

The osmotic gradient is set up by

Answer 3

The absorption of salts and nutrients.

Question 4

How does Na+ get absorbed

Answer 4

By passive movement via the paracellular pathway or by active transport via the cells.

Question 5

Transport for carbohydrates is by

Answer 5

Active transport, co-transporter with sodium via the cellular pathway.

Question 6

Apical membrane

Answer 6

Sodium-glucose transporter

Question 7

Basolateral membrane

Answer 7

Glucose carrier

Question 8

How do chylomicrons exit the cell?

Answer 8

By exocytosis

Question 9

How do chylomicrons enter the lacteals?

Answer 9

Lacteals

Question 10

How is vitamin B12 absorbed?

Answer 10

In the ilium, it binds to intrinsic factors (produced in the stomach).

Question 11

The greater the surface area the _______the rate of absorption

Answer 11

faster

Question 12

How many membranes do solutes have to cross with cellular transport?

Answer 12

2 - they are lipid bilayers