The osmoregulatory process called secretion refers to the
A)formation of filtrate at an excretory structure.
B)reabsorption of nutrients from a filtrate.
C)selective elimination of excess ions and toxins from body fluids.
D)formation of an osmotic gradient along an excretory structure.
E)excretion of urine from the body.

Question

Quizplus · Accepted Answer

Secretion is the process by which excess ions and toxins are selectively eliminated from body fluids. It differs from filtration (choice A) which is the formation of filtrate at an excretory structure and reabsorption (choice B) which is the process of reclaiming nutrients from the filtrate. Formation of an osmotic gradient (choice D) is part of the process of excretion but not specifically related to secretion. While urine excretion (choice E) is the end result of many osmoregulatory processes, it is not specifically related to secretion.

The Osmoregulatory Process Called Secretion Refers to the