Water reabsorptio A. Glomerulus

B. Renal tubules only

C. Efferent vessel

D. Renal tubule and collecting duct

Glomerulus

Function

1. Development of Filtration pressure

It occurs because of 2 reasons

a. The diameter of efferent arteriole is smaller than that of afferent arteriole

b. Pressure of blood flow due to heart

2. Ultrafiltration

It occurs because of 2 reasons

a. Filtration pressure

Small sized pores

Renal Tubule

Renal Tubule comprises of

1. Proximal Convoluted tubule

-reabsorbs all glucose, amino acids, 2/3 Na and water

2. Loop of Henle

-ascending loop – impermeable to water, reabsorbs Na

-descending loop – impermeable to Na, reabsorbs water

3. Distal Convoluted tubule

-actively reabsorbs Na and Cl,

Impermeable to water, Reabsorption of water can only occur in presence of ADH/vasopressin hormone.

Efferent vessel

It carries the filtered blood out of the glomerulus

Collecting duct

Route of urine flow

Glomerulus (filtrate) Bowman’s Capsule Proximal Convoluted tubule Descending loop of henle ascending loop of henle Distal Convoluted tubule Collecting tubule collecting duct (urine) duct of belleni papillary duct minor calyx major calyx Ureter

Impermeable to water, Reabsorption can occur only in presence of ADH/vasopressin hormone