Question

9) Which of the following is greater? (1 point)

A) The solute concentration in the filtrate at the descending limb of the Loop of Henle

B) The solute concentration in the filtrate at the ascending limb of the Loop of Henle

C) The concentrations at the ascending and descending limbs are identical.

10) When the level of ADH increases, (1 point)

A) Increases the permeability of the collecting ducts to water

B) Blood pressure will drop

C) Causes the kidneys to produce a larger volume of very dilute urine

D) The blood will thicken

E) Is secreted in response to low potassium ion in the blood

11) The mechanism for producing concentrated urine depends on the functions of which part of the nephron? (1 point)

A) The proximal convoluted tubule

B) The nephron loop

C) The collecting duct

D) The distal convoluted tubule4

Answer 1

9.(a) is correct because-

Physiology. The descending loop of Henle receives isotonic (300 mOsm/L) fluid from the proximal convoluted tubule (PCT). ... Substances reabsorbed in the PCT include urea, water, potassium, sodium, chloride, glucose, amino acids, lactate, phosphate, and bicarbonate.

10.(a) is correct because-

Water excretion by the kidney is regulated by the peptide hormone vasopressin. Vasopressin increases the water permeability of the renal collecting duct cells, allowing more water to be reabsorbed from collecting duct urine to blood.

11.(b) is correct because-

This part of the nephron is called the loop of Henle. Its main function is to reabsorb water and sodium chloride from the filtrate. This conserves water for the organism, producing highly concentrated urine