Part 1: Vocabulary Matching

Match each body system in the left column with its main job in the right column. Write the correct letter beside each number.

1. Digestive system: _____

2. Respiratory system: _____

3. Circulatory system: _____

4. Skeletal system: _____

5. Nervous system: _____

A. Sends messages through the brain, spinal cord, and nerves

B. Breaks food into nutrients the body can use

C. Brings oxygen into the body and removes carbon dioxide

D. Supports and protects the body with bones

E. Transports blood, oxygen, and nutrients around the body

Part 2: Systems at Work

Read each question carefully. Choose the best answer or write a complete response.

6. Which system helps your body move by pulling on bones?

Muscular system

Digestive system

Respiratory system

7. Label each description with the correct system: respiratory, circulatory, or digestive.

a) This system takes oxygen from the air: ____________________

b) This system carries oxygen to body cells: ____________________

c) This system breaks food into nutrients: ____________________

8. Explain how the respiratory and circulatory systems work together.

9. Application: After running, your breathing and heartbeat become faster. Why does this happen?

Answer Key

1. B

2. C

3. E

4. D

5. A

6. Muscular system

7. a) Respiratory system b) Circulatory system c) Digestive system

8. The respiratory system brings oxygen into the lungs. The circulatory system carries that oxygen in the blood to cells throughout the body and carries carbon dioxide back to the lungs.

9. Muscles need more oxygen and nutrients during exercise. The lungs work faster to bring in oxygen, and the heart beats faster to deliver oxygen-rich blood to the muscles.