More than 40% of the body's mass is muscle. There are three types of muscle tissue - skeletal, smooth and cardiac. Each one has a different structure/purpose.
Skeletal muscles are usually attacked to bones. They are responsible for voluntary movements. It is also called striated muscle. Most of them are controlled by the central nervous system.
Skeletal muscles are long and thin. Smooth muscles are usually not under voluntary control. Cardiac muscle is found in the heart.
A muscle contracts when the thin filaments in the muscle fiber slide over thick filaments.
The energy for muscle contraction is supplied by ATP.
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