The muscular system
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The Muscular System. Your Muscles. Functions of the Muscular System. A muscle is made of strong tissue that can contract in an orderly way. When a muscle contracts, the cells of the muscle become shorter. When a muscle relaxes, the cells return to their original length.

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The muscular system

The Muscular System

Your Muscles

Functions of the muscular system
Functions of the Muscular System

  • A muscle is made of strong tissue that can contract in an orderly way.

  • When a muscle contracts, the cells of the muscle become shorter.

  • When a muscle relaxes, the cells return to their original length.

Functions of the muscular system cont
Functions of the Muscular System (cont.)

  • Bones move when muscles contract.

  • There are many muscles in your body that are not attached to bones.

  • The contraction of these muscles cause blood and food to move throughout your body.

  • Muscles that are attached to bones support your body and help you balance.

  • Muscles protect your body by covering most of your skeleton and most of the organs inside your body like a layer of padding.

Functions of the muscular system cont1
Functions of the Muscular System (cont.)

  • Shivering occurs when muscles contract rapidly and change chemical energy to thermal energy, thereby raising your body’s temperature.

  • Muscles also change chemical energy to thermal energy during exercise.


Muscle Attach to Bones

  • Tendons are strands or tough connective tissue that connect your skeletal muscles to your Bones.

    Muscles Work in Pairs

  • Skeletal muscles often work in pairs. A muscle that bends part of your body is called a flexor. A muscle that straightens part of your body is an extensor.

Muscle pairs cont
Muscle Pairs (cont.)

Bend Your Arm

  • Bicep muscles-contract (flexor)

  • Tricep muscles-relax (extensor)

    Straighten Your Arm

  • Bicep muscles-relax (flexor)

  • Tricep muscles-contract (extensor)

Muscle control voluntary muscles
Muscle Control: Voluntary Muscles

  • Muscles that you are able to control

    • Ex. Arm and leg muscles, muscles of your hands and face

  • You can choose to move them or not

Muscle control involuntary muscles
Muscle Control: Involuntary Muscles

  • Muscles that you can’t consciously control

  • These muscles work all day long, all your life.

    • Ex. Blood gets pumped through blood vessels, food is moved through the digestive system by the action of involuntary muscles.

Three types of muscle 1 smooth
Three Types of Muscle: (1) Smooth

  • Muscles found in the walls of many organs

  • Involuntary in action cannot be controlled by will/brain

    • Ex. Digestive system and blood vessels

Three types of muscle 2 cardiac
Three Types of Muscle: (2) Cardiac

  • An involuntary muscle found in your heart

  • Appear striated or skeletal in nature

Three types of muscle 3 skeletal
Three Types of Muscle: (3) Skeletal

  • Alsocalled striated muscles

  • These muscles are attached to the skeleton for movement.

  • Can be voluntary or involuntary

    • Ex. Legs/arms are voluntary

  • Skeletal muscles work in pairs

Keeping muscles healthy
Keeping Muscles Healthy

  • Exercise helps keep muscles healthy. Muscle cells decrease in size and strength without exercise.

  • Resistance Exercise

    • During resistance exercise, people work against the resistance, or weight of an object to strengthen their skeletal muscles.

  • Aerobic Exercise (using oxygen)

    • Steady, moderately intense activity is called aerobic exercise and it strengthens the heart and increases endurance.

Muscle injury
Muscle Injury

  • A strain is an injury when a muscles or tendon is overstretched or torn.

  • A sprain is when a ligament is stretched or torn from a joint.

  • People who exercise too much can hurt their tendons. Inflamed tendons is called tendonitis.

The muscular system and homeostasis
The Muscular System and Homeostasis

  • Muscle contractions convert chemical energy to thermal energy and keep your body warm.

  • When you exercise, the cardiac muscles of your heart help maintain homeostasis by contracting more often.

  • When it contracts faster, the heart pumps more blood and more oxygen is carried to the cells.

Lesson review questions 1
Lesson Review Questions: 1

What happens to a muscles when it contracts?

  • It becomes stronger

  • It becomes shorter

  • It becomes longer

  • It bends

Lesson review questions 2
Lesson Review Questions: 2

What kind of muscles line blood vessels and many organs?

  • Smooth Muscles

  • Voluntary Muscles

  • Cardiac Muscles

  • Skeletal Muscles

Lesson review questions 3
Lesson Review Questions: 3

What is the term used to describe muscles that you can consciously control?

  • Skeletal

  • Involuntary

  • Cardiac

  • Voluntary