Body Systems

2. The ________________ is a short loop from the heart to the lungs and back again
5. The nerves that go through the whole body make up the __________________
9. the brain and the spinal cord are the _________________
11. The ______ is also called the voice box
15. The human brain weighs ______ pounds
16. _______ is where most of the body's blood cells are made
17. Cancellous bone resembles _____
18. ________ is found in the heart
19. ____________ are networks of tiny blood vessels

1. _________ is the solid, hard outside part of the bone
3. Bones are made up of a framework of a protein called ________
4. The lungs and ____________ allow us to breathe
6. smooth muscle is also referred to as_________
7. The _____ is a big artery that leaves the heart carrying this oxygenated blood
8. Muscles move body parts by contracting and then ________
10. ________is attached by cord-like tendons
12. air enters the respiratory system through the ____ or the mouth.
13. The _________ is the largest and most complex part of the brain
14. The __________________ carries blood from the heart to all the other parts of the body and back again