Proximal Tubule Function

Question 1

• What main mechanism occurs in the proximal tubules?

Answer 1

Reabsorption, mainly coupled to Na+ (and some secretion)

Question 2

• What is reabsorbed in the proximal tubule by endocytosis?

Answer 2

Small proteins and peptide hormones

Question 3

• What is the difference between primary and secondary active resorption?

Answer 3

Primary makes direct use of metabolic energy in the form of ATP, secondary uses metabolic energy indirectly in the form of a concentration gradient created by a primary active transport process

Question 4

• How are negative ions reabsorbed?

Answer 4

Passively through concentration or electrical gradient