This document discusses the major organs and structures of the human body. It explains that muscles contract and relax to pull on bones and help us move. It identifies the brain, heart, and lungs as vital organs that are protected by bones like the skull and ribs. The spine and ribs are located in the torso area of the body. The brain is located in the head and is responsible for thinking.

1. THE HUMAN BODY

2. MUSCLES

3. Bones and muscles help us move.
skeleton muscles

4. Muscles are elastic and soft.

5. Muscles contract and relax.

6. Muscles pull bones to move them.

7. The skeleton protects your body.

8. The skull protects the brain.
brain

9. This is
my
brain.

10. The brain
is an
organ.

11. We think with our brain.

12. The ribs protect the heart.
heart
rib

13. This is
my
heart.

14. The heart is
an organ.

15. Our heart pumps blood around our body.
blood

16. The ribs protect the lungs.
lung
rib

17. These are
my lungs.

18. The lungs
are
organs.

19. We breathe with our lungs.

20. Where’s the spine?
head
torso
limbs

21. Where’s the spine?
torso

22. Where are the ribs?
head
torso
limbs

23. Where are the ribs?
torso

24. Where is the skull?
torso
head
limbs

25. Where is the skull?
head