The muscular system makes movement possible.

The human body is made up of systems that work together to perform necessary functions.

Muscles perform important functions.

Muscles are involved in every movement of the

body.

Muscles allow your body to move, to

generate heat, and to maintain posture.

Each muscle fiber or strand can contract or

stretch.

Muscles are made of individual cells called

muscle fibers.

The muscular system works with the skeletal system to allow movement.

Individual cells, called muscle fibers, contract and relax.

Muscles are attached to bone by stretchy connective tissue, and, working in pairs, they contract and relax to move the body.

Muscles assist in homeostasis by functioning to maintain body temperature.

When muscles contract they release heat, so the quick muscle contractions that occur when you shiver release heat and raise your body temperature.

Muscles make constant, automatic, tiny adjustments to keep you sitting or standing upright.

The muscles that maintain posture are only completely relaxed when you are unconscious.

The body has three types of muscles.

Skeletal muscles are attached to the

skeleton.

Cardiac muscle is found in the heart.

Smooth muscle are found inside certain

organs

Nonexample:Heart muscles

Characteristics:Perform voluntary

movement

Definition:attached to the skeleton

Example:Leg muscles

Skeletal Muscles

Nonexample:Smooth muscle

Characteristics:Made of long fibers

Definition:Muscles that move when

you want them to.

Example:Leg muscles

Voluntary Muscles

Smooth muscles are the muscles that perform automatic movement inside the intestines and the stomach.Smooth muscles are involuntary, while skeletal muscles are not.

Smooth muscles are found in organs while skeletal muscles are attached to the skeleton.

Smooth Muscles

Nonexamples:Stomach muscles

Characteristics:Has a branched shape

Definition: Muscle the heart is made

of.

Example:The muscle cells in the

heart

Cardiac Muscle

Skeletal muscles and tendons allow bones to move.

The tendon is the link between the muscle and the bone. When a muscle contracts, it pulls on the tendon, which pulls the bone.

Muscles grow and heal.

During early childhood muscles are not yet well

developed.

Sore muscles indicate damaged muscle fibers.

Regular exercise increases muscle size.

As humans grow older, muscles develop and

become more coordinated.