01 DEFINITION Excretory organs in animals Planaria - Protonephridia Branchiostoma - Protonephridia Earthworm - Nephridia. Cockroach - Malpighian tubule Cray fish - Green gland Pisces, amphibians, reptiles, birds and mammals - Kidneys 02 DEFINITION Excretory system in other organism 03 DEFINITION Osmoconformers Osmoconformers change their body fluid osmolarity to match the concentration of the medium. 04 DEFINITION Process of osmoregulation In humans, the kidney plays an important role in osmoregulation of body's internal environment. The body shows osmoregulation in two common ways or cases, dehydration and waterlogging. In case of dehydration, the hypothalamus gives the signal to the pituitary gland to secrete ADH (antidiuretic hormone). ADH increases the reabsorption of water in the renal tubules of the kidney and increases the blood volume and concentration of body fluids. In case of...
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