Reptiles excrete nitrogenous wastes as uric acid in the form of pellet or paste with a minimum loss of water and are called uricotelic animals.

Sweat produced by sweat glands is a watery fluid containing NaCl , small amounts of urea, lactic acid, etc. Its primary function is to facilitate a cooling effect on the body surface and also to helps in removal of waste.

In prawns, the excretory organs are known as antennary glands or green glands. These glands are opaque-white pea sized structures, enclosed in the coxa of each 2nd antenna. They mainly excrete ammonia.

Contractile vacuole is the excretory organ in Amoeba. It is also involved in osmoregulation.

(a) ANF Atrial Natriuretic Factor

(b) ADH Antidiuretic Hormone

(c) GFR Glomerular Filteration Rate

(d) DCT Distal Convoluted Tubule