THE HUMAN BODY

The Urinary System Part Ia
Water balance and waste disposal

INTRODUCTION In the body, water is the "Cell’s living" environment and nutrients

All energy sources absorbed by the intestinal tract are used by body cells; the cells produce energy and waste products.

Water is an essential element of the internal environment the cells of the body live in this body water environment.
Most nutrients reach the cell dissolved in body water and.
The waste products are sent out of the cell dissolved in body water.
The Kidneys are the principal control organs of the internal environment.

The urinary system consists of the two kidneys which act as filters of the body water – one situated, on each side, high up in the abdomen, behind the intestines.

The two ureters carry the filtered urine to the bladder. The bladder - the urine tank is situated low down in the abdomen.

The urethra leading from the bladder is the - exit route and allows the urine to be expelled from the body.

The task of the urinary system, is to maintain the water balance in the body, an important function since two thirds of body weight is because of body water.
This it achieves by excreting the extra water that we drink
Excretion of water comes down when body is short of water.
It also excretes the extra salt that we have taken in.
If we are short of any salt in our body then the kidneys re-absorbs, that salt for use by the body.
These salts are essential for the body needs.

Another function of the kidney is to excrete waste products received in the blood and these wastes are - urea and in some cases drugs.
Most of these substances mentioned above are brought (transported) to the kidney dissolved in water in the blood -thus water is essential for the body and for the urinary system.
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