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moving a body part away from the midline

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moving a body part towards the midline

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forms the walls of the heart and contracts to circulate blood

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moving in a circle at a joint, or moving one end of a body part in a circle with the other end remains stationary

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becoming short and thick, which causes movement

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muscle fiber that are stimulated by nerves contract, or become short and thick, which causes movement

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a permanent shortening and tightening of the muscle

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bending backward or bending the foot towards the knee

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allows the muscle to return to its original shape after it has contracted or stretched

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irritability, the ability to respond to a stimulus such as a nerve impulse

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the ability to be stretched

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increasing the angle between two bones, or straightening a body part

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a tough, sheetlike membrane that covers and protects the tissue

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decreasing the angle between two bones, or bending a body part

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the end that moves when the muscle contracts is called the insertion

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meaning they function without conscious thought or control

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muscles are partially contracted at all times, even when not in use, this state of partial contraction is called muscle tone

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more than 600 muscles make up the system known as the muscular system, bundles of muscle fibers held together by connective tissue

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when a muscle attaches to a bone, the end that does not move is called the origin

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bending forward or bending the foot away from the knee

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turning a body part downward

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turning a body part around its own axis; for example, turning the head from side to side

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is attached to bones and causes body movement, this muscle is voluntary

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turning a body part upward

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skeletal muscles attach to bones in different ways, some attach by tendons

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skeletal muscle is voluntary because a person has control over its action