Question

describe the human exectory system

Answer 1

The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body.
Parts of the excretory system:

Kidneys: Within each kidney are an estimated one million microscopic nephrons. ...
Ureters: Ureters are muscular ducts that propel urine from the kidneys to the urinary bladder. ..
.Urethra: ..
.Bladder: ...

Answer 2

The excretory system consists of the organs that remove metabolic wastes from the body. In humans, this includes the removal of liquid nitrogenous waste in the form of urine, and solid wastes especially from the breakdown of hemoglobin. 
While we consume food and drink to nourish the body and provide energy, the excretory system ensures that homeostasis is maintained, irrespective of changes to the nutritive value of food.

It regulates the fluid balance of the body, maintaining adequate salt and water levels. When there is excess water, it is removed through the production of hypotonic urine. When we consume salty food, or lose water through perspiration, the concentration of urine is increased, to preserve the osmolarity of body fluids.

The excretory system, especially the urinary tract, is necessary for preventing the toxic build up of nitrogenous wastes, such as ammonia or urea.

The kidneys secrete a hormone called erythropoietin that induces the bone marrow to produce more red blood cells.
The primary excretory organs in the human body are the kidneys, ureters and urinary bladder, involved with the creation and expulsion of urine. Through these organs, much of the nitrogenous waste of the body, especially urea, is expelled. Other organs such as the liver, large intestine and skin are also necessary for the excretion of specific metabolic wastes.

Kidneys

The kidneys are paired, bean-shaped organs located in the abdomen, on either side of the spine, under the diaphragm. They are made of a large number of structural and functional subunits called nephrons. These nephrons perform the primary task of filtering blood and removing waste products. Each nephron snakes between the outer cortex of the kidney and the inner medulla, with different activities occurring at each site.

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