Selective reabsorbtion

Question 1

How is proximal convoluted tubule adapted for selective reabsorption?

Answer 1

• The epithelial cells contain mitochondria to produce ATP for active transport.
• The membrane contains a large number and variety of co-transport proteins.
• Microvilli in the epithelial cells increase the surface area for diffusion.
• There is a short diffusion distance through one epithelial cell.

Question 2

What happens during selective reabsorbtion?

Answer 2

During selective reabsorption, sodium ions are transported from the epithelial cell into the blood via active transport. Sodium ions and other substances in the lumen are then transported into the epithelial cell via facilitated diffusion using co-transport proteins. These substances then travel down their concentration gradient into the blood .

Question 3

where does selective reabsorption take place?

Answer 3

proximal convoluted tubule.

Question 4

what is the process by which water is selectively reabsorbed?

Answer 4

osmosis

Question 5

what are three adaptations of the proximal convoluted tubule?

Answer 5

1. the epithelial cells contain mitochondria to produce ATP required for active transport.
2. the membrane contains a large number of co-transport proteins.
3. microvilli in epithelial cells to increase the surface area.
4. short diffusion distance between one epithelial cell.