4.5 Co Transport

Question 1

What are the 3 layers involved in co transport in the small intestine?

Answer 1

Lumen of ileum
Epithelial cell
Blood

Question 2

What are co transporters?

Answer 2

Carrier proteins that require 2 particles to open

Question 3

How do co transporters assist moving against a concentration gradient?

Answer 3

One particle moving along its concentration gradient forces another against its concentration gradient

Question 4

What are the pumps called that connect the ileum and the blood?

Answer 4

Sodium-potassium pumps

Question 5

How does glucose get from the lumen of ileum to the blood?

Answer 5

Sodium ions force glucose against its concentration gradient via co transport and then glucose can simply diffuse out into the blood from the epithelial cell

Question 6

How does sodium get from the lumen of ileum to the blood?

Answer 6

Co transport along concentration gradient into epithelial cell than is actively transported into the blood by a sodium-potassium pump

Question 7

What is endocytosis?

Answer 7

Where a substance is pocketed by a membrane whilst the membrane pinches off and reforms

Question 8

What is exocytosis?

Answer 8

A substance being engulfed by being pocketed by a membrane

Question 9

Do exo and endocytosis require ATP?

Answer 9

Yes