BIOLOGY [2 Mark Question Answer]

Urine formation: kidneys.
Transport of urine away from the kidney: urethra.
Temporary storage of urine: urinary bladder

During different metabolic activities taking place in our body, the body produces many substances of which some are useful and some are useless.
If retained in the body the unwanted substances may become poisonous and cause much harm and in severe cases, even death. The organs which remove these unwanted and toxic substances from the body are called excretory organs.

During different metabolic activities taking place in our body, the body produces many substances of which some are useful and some are useless.
The process of removal of useless and harmful metabolic waste substances is called excretion.

Kidney stones are formed when crystal-forming substances such as calcium oxalate, calcium phosphate, and uric acid are more than the fluid in the urine. When these chemicals start sticking together, they form crystals, commonly called kidney stones. They may be formed and cause severe pain.

The two ways by which a person can get relief in case of kidney failure are:

1. Dialysis: this is a method in which an artificial machine cleans and filters the blood.
2. The patient can undergo kidney transplant.

The excretion is necessary because the toxic products if allowed to be retained in the body act as poison and cause great harm to the body. If they exceed the threshold, they may even cause death.

The process of elimination of unwanted and toxic products from the body is called excretion.
The four organs of the urinary system from above to downward are:

1. kidneys
2. ureter.
3. urinary bladder
4. urethra.

1. Skin – excretes excess water, urea, salts, and other metabolic wastes in the form of sweat. These waste products are carried by the blood from all body parts to sweat glands in the skin.
2. Lungs – Eliminate carbon dioxide produced as a result of respiration through the nose.