Question

Indicate whether the following statements are true or false.

(a) Micturition is carried out by a reflex.

(b) ADH helps in water elimination, making the urine hypotonic.

(c) Protein-free fluid is filtered from blood plasma into the Bowman's capsule.

(d) Henle's loop plays an important role in concentrating the urine.

(e) Glucose is actively reabsorbed in the proximal convoluted tubule.

Answer 1

(a) The act of passing the urine is called as micturition. It is a reflex reaction. Distension stimulates the stretch receptors located in the wall of the bladder and the reflex activity is carried out. Hence, the statement is true.

(b) ADH (Anti diuretic hormone) is produced by the hypothalamus and secreted by the neurohypophysis (posterior pituitary gland). ADH increases the re-absorption of water in the collecting ducts and reduces the formation of urine. Hence, the statement is false.

(c) Glomerular filtrate contains all the components of plasma except protein. Hence, the statement is true.

(d) The counter current multiplication in the loop of Henle plays is responsible for concentrating the urine. Hence, the statement is true.

(e) Glucose and sodium are absorbed by the proximal convoluted tubule and returned back to the blood by active transport. Hence, the statement is true.