Functions of the Muscular System

Involuntary

Some involuntary functions of the muscular system are muscles to help you breathe, make your heart beat, and help move food through the digestive system.

Voluntary

Some voluntary functions of the muscular system are like playing

piano, running, playing video games, and throwing a ball.

Muscular systemMuscular system

•Nearly half of Nearly half of body weight is body weight is muscle weight.muscle weight.

•The 206 bones of The 206 bones of the skeletal the skeletal framework are framework are covered by covered by nearly 650 nearly 650 muscles.muscles.

Muscle fibersMuscle fibers

• Muscles are composed of many Muscles are composed of many bundles of stringy fibers bound bundles of stringy fibers bound together in bunches.together in bunches.

Tendons & ligamentsTendons & ligaments• Muscles are Muscles are

connected to connected to bones by bones by tendons, which tendons, which are tough, are tough, elastic-type elastic-type bands of bands of connective connective tissue.tissue.

• Bones are Bones are connected to connected to each other by each other by ligaments.ligaments.

Muscle ContractionMuscle Contraction

•Muscles, Muscles, when when stimulated stimulated by a nerve to by a nerve to act, contract act, contract and produce and produce body heat.body heat.

Muscles work in pairsMuscles work in pairs

Lactic Acid Lactic Acid FermentationFermentation

•Muscles also produce a chemical Muscles also produce a chemical called lactic acid if the muscles called lactic acid if the muscles work a long time.work a long time.

•This acid causes muscles to This acid causes muscles to become tired.become tired.

ExerciseExercise

• In order to strengthen muscles, In order to strengthen muscles, plenty of daily, vigorous exercise plenty of daily, vigorous exercise for short periods, with gradually for short periods, with gradually more effort each time, is necessary.more effort each time, is necessary.

• Muscle fiber increases in size with Muscle fiber increases in size with use - not in number as once use - not in number as once thought.thought.

• Muscles not exercised will shrivel Muscles not exercised will shrivel and become weak.and become weak.

• This deterioration can happen over This deterioration can happen over a short period of time.a short period of time.

3 Types of muscles3 Types of muscles

• Skeletal Skeletal MuscleMuscle

• Smooth MuscleSmooth Muscle

• Cardiac MuscleCardiac Muscle

Skeletal muscleSkeletal muscle

Smooth muscleSmooth muscle

Cardiac muscleCardiac muscle

Problems of the Muscle System

Bruise- is a area of discolored skin that appears after an injury.

Tendonitis- is a inflammation of the tendon, caused by injury or over use aging

Hernia- when a organ or tissue protrudes through an area of weak muscle.

The Muscular System