Grade 7- Urinary System

The excretory system removes waste from the body in human beings.

Examples of waste in the human body include:

1. Urine.

2. Salt.

3. Excess water.

4. Carbon dioxide.

Importance of excretion.

Excretion helps to remove harmful waste products from the body. This prevents them from accumulating to toxic levels which can cause sickness or death.

Parts of the Urinary system.

Parts of the Urinary system.

The Urinary system consists of:

1. Kidneys.

2. Vessels serving the kidney.

3. Ureters.

4. Urinary bladder.

5. Urethra.

6. Ureter

Part Function	Function
Vessels serving the kidney	Carry urea in the blood stream to the kidney, where it is removed along with water and other wastes in the form of urine.
Kidneys	They are a pair of reddish-brown organs that are bean shaped. They are the organs that filter the blood, remove the wastes and excrete the waste in the urine.
Urinary bladder	It is a hollow organ located in the lower abdomen that is triangular in shape. The urinary bladder is a temporary storage place for urine.
Ureters	These are narrow tubes that carry urine from the kidney to the urinary bladder. Humans have two ureters, one attached to each kidney
Urethra	This tube allow urine to pass outside the body from the urinary bladder.