Page 212 - New Medley 3 Semester 1

ORGAN SYSTEMS

e main organ systems in our body are:

1. Skeletal system 4. Respiratory system 7. Nervous system

2. Muscular system 5. Circulatory system 8. Reproductive system

3. Digestive system 6. Excretory system

Let’s understand the di erent organ systems of our body.
Skeletal System

Do you feel something hard inside your arm,

hand, chin and forehead? is hard thing is
bone. ere are 206 bones in our body. All

these bones join together to form the skeletal
system.

e skeletal system gives shape and support to

our body. It protects the delicate organs like

heart, lungs and brain present inside our body.
For example, the skull protects the brain and

the ribcage protects the heart and lungs.

Muscular System Skeletal system Muscular system

e muscular system is made up of muscles. ere are

more than 600 muscles in our body. ese muscles
cover the bones. Muscles help us in walking, jumping,
writing, eating and running. Doing exercise daily makes Mouth

our muscles strong. Food
pipe
Digestive System

We eat food to get energy. But food does not give

energy directly. Inside our body, the digestive system Stomach
changes the food into a simpler form which is used Small
by the cells of the body. intestine
Large

e digestive system is made up of the mouth, foodpipe, intestine
stomach, small intestine, large intestine and anus.
Anus

e mouth has teeth to cut the food into small pieces
Digestive system

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