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3. Define digestion.

4. How is blood carried to different parts of the body?

IV. Answer the following questions in three or four sentences.

1. What is nervous system? Name the organs of the nervous system.

2. What are muscles? How do they help us?

3. What is the function of the heart?

4. Write about the respiratory system.

5. What happens to the food we eat?

6. What is the function of the excretory organs?

H TS Critical Thinking

Which is the most important organ system in the human body? Why is it
important?

Know More

Our arms and legs are also known as upper and lower limbs. The upper
limbs are smaller and shorter. The lower limbs are larger and longer.

Let’s Write Mathematics Integration

Write down the number and complete the table.

Organs Number Organs Number

Brain Lungs

Spinal cord Kidneys

Heart Toe nails

Eyes Fingers

Stomach Bones

23
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