Absorbtion

Question 1

Proximal tube

Answer 1

The proximal tube has many mitochondria, it also has the active transport of Na+ ions, glucose, and other solutes in the blood

• negative ions move passively, attracted by an electrical charge

Question 2

Loop of henle

Answer 2

Reabsorbs water and ions from the filtrate

Question 3

Descending limb

Answer 3

Is permeable to water therefore at the bottom of the limb the Na+ concentration is at its highest

Question 4

Ascending limb

Answer 4

Is impermeable to water and permeable to solutes
- Na+ diffuses into the blood first and then moves by active transport