Co-transport

Question 1

What uses carrier proteins?

Answer 1

Active transport. It can’t use channel because substances can only move through them along the concentration gradient but AT (low to high) goes against

Question 2

What uses carrier and channel proteins?

Answer 2

Facilitated diffusion

Question 3

How is glucose transported?

Answer 3

1) Sodium ions are actively transported out of the cell by SPP into blood. 1 type of carrier
2) Maintains higher [sodium ions] in lumen than in cell
3) Sodium ions diffuse into the epithelial cell down [gradient] through carrier protein and carry a glucose molecule.
4) Glucose passes into blood by FD using another type of carrier.

Question 4

How are amino acids transported?

Answer 4

1) Sodium ions are actively transported out of the cell by SPP into blood. 1 type of carrier
2) Maintains higher [sodium ions] in lumen than in cell
3) Sodium ions diffuse into the epithelial cell down [gradient] through carrier protein and carry an amino acid molecule.
4) Amino acids pass into blood by FD using another type of carrier.

Question 5

Why is co-transport for necessary?

Answer 5

Maintains higher concentration of glucose and sodium ions in the lumen of the intestine than inside the epithelium cells.