Question

Why would drinking sea water make you more dehydrated?

Select one:

a. Vasopressin would no longer be able to insert aquaporins in the distal tubule

b. Increased Na+ in the filtrate would lead to increased secretion of water in the distal tubule

c. Increased intake of Na+ would lead to increased tubular reabsorption of Na+

d. The ascending limb of the Loop of Henle would become permeable to water

e. All of the above

Answer 1

Answer

Option B) Increased Na+ in the filtrate would lead to increased secretion of water in the distal tubule

• Sea water is much more concentrated than normal water.
• Sea water contains lots of sodium ions.
• As sodium ions increases in blood, more of them are filtered in the nephron.
• When solute concentration increases in renal tubule, a concentration gradient will causes more water to be secreted in the distal tubule.
• Due to excretion of much water, dehydration occurs.