Page 38 - Viva ICSE Science 4 : E-book

The Excretory System

The excretory system is the organ system responsible for

removing wastes from our body. The process of removal
of wastes from the body through excretory system is kidney

called excretion. The excretory system consists of a pair
of kidneys, a pair of ureters, urinary bladder and urethra. ureter

Organs of the excretory system urinary
bladder
Kidneys are the main excretory organs. They fi lter and
urethra
remove wastes, salts and extra water from the blood.
Excretory system in humans
The waste removed from the blood forms urine.

Ureters are the thin tubes that carry urine from the kidneys to
Did You Know!
the urinary bladder. These are two in number.
Urine and sweat help
Urinary bladder is the organ that stores urine before it is to excrete excess

excreted out of the body. water and salt from
the body.
Urethra is the tube that carries urine from the bladder to the

outside of the body.

ACTIVITY TIME

To observe the models of digestive and excretory systems

Go to the biology laboratory along with your class teacher and observe the models of digestive
and excretory systems. Draw well-labelled diagrams of both the organ systems.

Healthy Food Habits Related to Digestion and Excretion

Developing healthy food habits helps in proper digestion of food and excretion of

wastes from our body. This keeps our body healthy. By following some simple ways that
are mentioned below, we can keep our body systems healthy.

• Wash your hands properly before and after every meal.

• Eat a diet that is rich in fi bre. It helps in easier movement
of food through the digestive system. Oats, beans and

fruits like banana, apple and orange are rich sources of
f ibre.

24