Science 3 · Unit 4: Staying alive · Cambridge Primary Science Stage 3

Questions

1. 1. Which organ pushes blood around your body?

   • the lungs
   • the brain
   • the heart
   • the stomach
   Check

2. 2. Which organs take in air so that we can breathe?

   • the lungs
   • the heart
   • the intestines
   • the brain
   Check

3. 3. Which organ helps you think?

   • the heart
   • the brain
   • the stomach
   • the lungs
   Check

4. 4. Which organs get nutrients from your food?

   • the brain
   • the stomach and intestines
   • the lungs
   • the heart
   Check

5. 5. What is the heart made of?

   • fat
   • skin
   • muscle
   • bone
   Check

6. 6. What do we call the tubes that carry blood around the body?

   • blood vessels
   • nerves
   • intestines
   • lungs
   Check

7. 7. Where can you feel your pulse?

   • in your hair
   • in your teeth
   • in your nails
   • in your wrist
   Check

8. 8. What happens to your heart rate when you exercise?

   • It goes down.
   • It goes up.
   • It stops.
   • It stays the same.
   Check

9. 9. Why do you breathe faster after exercise?

   • Your body needs less oxygen.
   • Your body needs more oxygen.
   • You are hungry.
   • Your lungs get smaller.
   Check

10. 10. Why do children take more breaths per minute than adults?

    • They need less oxygen.
    • Their lungs are smaller.
    • They are older.
    • Their lungs are bigger.
    Check

11. 11. Your heart rate goes up after exercise. What happens after two minutes of rest?

    • It stops.
    • It doubles.
    • It goes back down towards your resting rate.
    • It keeps going up.
    Check

12. 12. What are nutrients?

    • the air we breathe
    • the waste that goes to the toilet
    • things in food that help your body grow and work well
    • a kind of blood vessel
    Check

13. 13. Where does the brain get messages from?

    • your hair
    • your blood only
    • your sense organs
    • your intestines
    Check

14. 14. What happens to your brain if you make it work hard?

    • It gets better.
    • It gets worse.
    • Nothing.
    • It stops working.
    Check

15. 15. How can you look after your heart?

    • eat lots of sweets
    • eat a healthy diet and exercise each day
    • stay up all night
    • never move
    Check

16. 16. Marcus's heart rate went from 65 beats per minute at rest to 85 beats per minute after exercise. How much did it go up?

    • 10 beats per minute
    • 150 beats per minute
    • 85 beats per minute
    • 20 beats per minute
    Check