What is the Function of the Shark Rectal Gland

Question

What is the function of the shark rectal gland?
A) It concentrates electrolytes necessary for homeostasis in a hypertonic environment.
B) It is involved in osmoregulation.
C) It secretes a hypotonic solution.
D) It is responsible for excretion of undigested residue.

Accepted Answer

The shark rectal gland is an important component of their osmoregulatory system. Sharks live in a hypertonic environment, meaning that the concentration of salts in the water is higher than in their bodies. To maintain proper electrolyte balance, they must excrete excess salts. The rectal gland is responsible for producing a concentrated salt solution that is expelled from the body as urine, helping to regulate electrolyte levels. Therefore, option B is the correct choice.