Tubular Reabsorption + Secretion

Question 0

Secretion is the

Answer 0

Movement of solutes from the peri tubular capillaries into the tubular lumen.

Question 1

Reabsorption is the

Answer 1

Movement of water and solutes from the tubule lumen into the capillaries

Question 2

Reabsorption along different parts of the nephron

Answer 2

Proximal tubule (mass reabsorption)
Loop of Henle (concentration gradient in medulla- urine concentration)
Distal tubule and collecting duct

Question 3

Roles of secretion

Answer 3

Pathway of drug secretion
Increased elimination of wastes (creatinine)
Excreting excessive K+ ions
Controlling blood pH

Question 4

Summary

Answer 4

Na drives reabsorption of other solutes and water in the nephron.
Physiological control occurs in the distal tubule collecting duct.