1. Science Lesson 8 Muscles and Bones

2. What to think about…. What are the functions of muscles?
How do muscles work?
What are some of the different types of muscles?
What happens to muscles based upon their amount of use?

4. Muscles and bones are joined or attached by tissue called
tendons
It is the tendons that allow muscles to move the bones.

6. All body movement requires muscles. What if we are not moving?
Even sitting still we are using muscles. The heart beats, the diaphragm causes us to breathe, etc.

7. About how much of your body weight is muscle?
50%

9. What the Muscle Is Made Of?
Your muscles are made of small muscle fibers.
Tendons are stretchable material that connects
the muscles to your bones.

10. How do our muscles work?
Our muscles work by contracting and relaxing

11. How do muscles work? Muscles work by and .
contracting
relaxing
Skeletal muscles make us move. However, muscles are only capable of one type of force.
pulling

12. Since muscles can only pull and not push, how does this effect the way they work in the body?
The muscles have to work in pairs. One muscle of a pair bends a joint, while the other straightens it back out.

13. When the bicep contracts and the triceps relaxes, the arm bends.
When the Tricep contracts and the bicep relaxes the arm straightens.

14. When you don’t use your muscles they become and .
weak
flabby
Unused muscle cells actually become smaller if not used regularly.

15. But, if used regularly, they become larger and stronger.

16. How to Make Healthy Muscles!!!
Run
Lift weights
Play sports
Drink milk
Eat healthy food

17. Facts about the muscles!!!
Your heart is a muscle.
Your tongue is a muscle.
There are about 350 muscles in the human body.
Muscles are made of fibers.
The muscular system is the largest system in your body.