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Muscular strength

Bones are moved by muscles attached to them. These muscles are fastened to bones by a thin, tough tissue called tendonsTough, fibrous connective tissue that attaches muscle to bone., which also link muscles to other muscles.

Muscles come in all shapes and sizes. The human body has about 650 muscles, which make up about 40 percent of a person's body weight. Muscles are classified as voluntary or involuntary. Voluntary muscles are those you can control at will, such as moving your arm. Involuntary muscles act automatically, such as your stomach muscles digesting food. Some muscles fit into both categories, such as the muscle used in blinking your eyes.

Muscles are made of stacks of long, thin cells called muscle fibersStacks of long, thin cells that make up muscle; there are three types...

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1. Introduction
2. Bones, bones, bones
3. Hard and spongy
4. Muscular strength
5. Experiment 1 - Bone Loss: How does the loss of calcium affect bone strength?
6. Experiment 2 - Muscles: How does the strength of muscles affect fatigue over time?
7. Design Your Own Experiment