AP BIOLOGY

Detailed explanation-1: -The primary organs of excretion in gastropods are nephridia, which produce either ammonia or uric acid as a waste product. The nephridium also plays an important role in maintaining water balance in freshwater and terrestrial species.

Detailed explanation-2: -The excretory system of gastropods removes nitrogenous waste and maintains the internal water balance of these creatures, commonly referred to as snails and slugs. The primary organ of excretion is a nephridium.

Detailed explanation-3: -Nephridia. Many aquatic and terrestrial invertebrates use the nephridia as excretory organs. They are tubular or branched structures in contact with the internal body fluids on one side and open to the environment on the other side.

Detailed explanation-4: -nephridium, unit of the excretory system in many primitive invertebrates and also in the amphioxus; it expels wastes from the body cavity to the (usually aquatic) exterior.

Detailed explanation-5: -The nephridia are paired osmoregulatory-excretory organs on the internal body wall of each segment of a worm (ca. 200 nephridia per worm) that pass fluid from the coelom to the outside through a continuous winding tube that forms three major loops (20) (Fig. 1).