The kidney is an internal, bean shaped organ of vertebrates. Kidneys are responsible for secreting urine, regulate the electrolytes of the body and filter the blood.

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Beginning of the urogenital system

Are any invertebrate nephridia (proto/meta) homologous with vertebrate kidneys in the sense that embryologically they also begin together with the genital system? When did the embryologic association ...
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How do kidney cells excrete their own wastes?

The kidney is composed of tissues, and those tissues are made up of numerous cells - so how do these cells excrete their wastes? Lastly, are there any wastes in the venous blood (renal vein), what ...
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How sympathetic system lead to an increase in GFR?

ADH is a vasopressin. It affects the kidney by its constrictive effect on blood vessels. This causes an increase in blood pressure. The sympathetic nervous system follows the same process to decrease ...