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Integrated Science
Name __________KEY_________
Musculoskeletal System – Discovery Video Notes
1. How many gallons of air is the athlete Bobby able to inhale in one breath? __2__
2. Where is the extra heat produced in the muscles carried? ___to skin_____
3. What is the efficiency of human muscle? _25__%
Bone Facts:
4. How many bones do infants have? __350__
5. By age 25, how many bones to humans have? __206__
6. Bone is _4_ times as strong as reinforced concrete.
7. The average human skeleton weighs about _30_ pounds.
Inside Bones:
8. What fraction of a bone’s weight is living tissue? __1/3__
9. What part of the bone makes red blood cells? __marrow____
10. Bones are fully replaced every __2_ years.
11. The _knee_ is the most complex joint in the body.
12. Synovial fluid around bone joints decreases ___friction___.
The Vertebrae
13. How many pairs of nerves come out of the vertebrae? __31__
14. There are no ___nerves__ in the coccyx.
15. How many vertebrae bones are there? __24___
16. Our stubby toes give us _springiness (light steps!)__ .
Muscles
17. Muscles make up ___1/2_ our body weight.
18. There are ___656_ muscles in our body, about 3 per bone!
19. What type of diet will help build muscle? High protein (and exercise)
20. If all our muscles could pull together, we could lift __25_ tons.
Other types of muscles
21. Outside of our conscious control, what are two other types of muscle in our body?
Where is each found?
a. cardiac – in the heart
b. smooth – lining of stomach and
intestines
22. The build up of __lactic__ _acid__ in our muscles causes pain and fatigue when
we over work them.