What attaches muscles to bones?
Muscles are attached to bones by strong cords known as tendons.
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How do muscles cause movement?
Muscles contract to create movement, pulling on the tendon which pulls on the bone.
This action causes the bone to move in the direction the muscle contracts.
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What are antagonistic muscles?
Antagonistic muscles are pairs of muscles that cause movement and are arranged on opposite sides of a joint. When one muscle contracts, the opposing muscle relaxes.
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How do the biceps and triceps allow your arm to move?
To bend the arm, the bicep contracts while the tricep relaxes.
To straighten the arm, the tricep contracts, pulling in the opposite direction, while the bicep relaxes.
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Describe what happens to the length of muscles when they contract and relax.
When muscles contract they shorten.
When muscles relax they lengthen.
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