Question
Biology Question on Human Excretory System
ADH controls water permeability of
A
collecting tube
B
proximal convoluted tubules
C
distal convoluted tubules
D
all of the above
Answer
distal convoluted tubules
Explanation
Solution
The vasopressin hormone, secreted by neurohypophysis of pituitary gland promotes the reabsorption of water from the distal convoluted tubules of nephrons, reducing excretion of water in urine (= diuresis). Hence, it is called antidiuretic Hormone (ADH). Its release in blood is controlled by an 'osmoregulatory centre" located in hypothalamus. Hyposecretion of ADH causes diabetes incipidus.