Class 4 EVS Chapter 1- Organ System of our Body @kidsknowledgepoint


Our body is made up of different parts that work together to keep us healthy and alive. These parts are grouped into different organ systems. Each system has its special job. Let's learn about the main organ systems of our body:

1. Digestive System

  • Function: Breaks down food into smaller parts that our body can use.
  • Main Organs: Mouth, esophagus, stomach, intestines, and liver.
  • Example: When you eat an apple, the digestive system helps turn it into energy for your body.

2. Respiratory System

  • Function: Helps us breathe in oxygen and breathe out carbon dioxide.
  • Main Organs: Nose, windpipe (trachea), and lungs.
  • Example: When you take a deep breath, your respiratory system is working.

3. Circulatory System

  • Function: Carries blood, oxygen, and nutrients to different parts of the body.
  • Main Organs: Heart, blood, and blood vessels.
  • Example: The heart pumps blood to your legs when you run.

4. Skeletal System

  • Function: Gives our body shape, supports it, and protects delicate organs.
  • Main Parts: Bones and joints.
  • Example: Your skull protects your brain, and your ribs protect your heart and lungs.

5. Muscular System

  • Function: Helps us move our body.
  • Main Parts: Muscles.
  • Example: You use your muscles to lift your school bag or run during a game.

6. Nervous System

  • Function: Controls everything we do, including thinking, moving, and feeling.
  • Main Organs: Brain, spinal cord, and nerves.
  • Example: When you touch something hot, your nervous system tells you to pull your hand away.

7. Excretory System

  • Function: Removes waste products from the body.
  • Main Organs: Kidneys, bladder, and skin.
  • Example: When you sweat or go to the bathroom, your excretory system is working.

8. Reproductive System

  • Function: Helps in creating new life.
  • Main Organs: Different for males and females.

9. Endocrine System

  • Function: Produces hormones that help control how our body works.
  • Main Organs: Glands like the thyroid and pituitary gland.

10. Integumentary System

  • Function: Protects our body from the outside world.
  • Main Parts: Skin, hair, and nails.

Interesting Fact!

Did you know that adults have 206 bones in their body, while babies are born with about 300 bones? As they grow, some of the bones join together!

These organ systems work together like a team to help our body function properly.

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