Muscular system

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by Greciavt
Last updated 8 years ago

Human Anatomy

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Muscular system

A flexor is a muscle that bends a limb at a joint.An extensor is a muscle that straightens a limb at a joint.

"All or none" responseIt is the threshold response of each particular nerve cell and muscle fiber to a stimulus. If the stimulus exceeds the threshold potential, the nerve or muscle fiber will give a complete response; otherwise, there is no response.

Contractions.A contraction is the tightening of a muscle. As the muscle contracts, it becomes shorter and thicker, causing the belly (center) of the muscle to enlarge.

Skeletal muscles attach to the bones of the skeleton and are the muscles that make possible body motions such as walking and smiling.Smooth muscles are located in the walls of internal organs such as the digestive tract, blood vessels, and the ducts leading from glands.Cardiac muscle(myocardium) forms the muscular wall of the heart.

Muscular system

The three types of muscle tissue are skeletal, smooth, and cardiac.

Muscle fatigueIt occurs when a muscle is over-used. When you do too much your muscle gets fatigued.If you do not warm-up properly you can develop muscle fatigue.

Major muscles of the bodyPectoralis major: chest.Rectus abdominis: abdominal muscle.External abdominal oblique: abdominal muscle.Biceps brachii: muscle of the anterior upper arm that flexes the elbow.Triceps brachii: muscle of the posterior upper arm that extends the elbow.Quadriceps femoris: large muscle, which is located on the anterior thigh.Gluteus maximus: largest muscle of the buttock. Deltoid muscle: forms the muscular shoulder cap.

A tendon is a narrow band of nonelastic, dense, fibrous connective tissue.Tendons attach muscles to bone. Ligaments join bone to bone.


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