Muscular system

MUSCLE: an organ that can relax and contract, and
moves your body. There are two types:

Voluntary muscles: muscles you can control (bicep)
Involuntary muscles: muscles you cannot control

(heart)

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SKELETAL MUSCLE

• Moves bones
• Voluntary
• Tendons connect muscle to

bone

• Contract quickly and tire more

easily

• Look striped or striated
• Ex: Bicep, quadriceps, pectoral

THE TYPES OF MUSCLE TISSUE

Draw and label the striated
muscle in the circle on your

paper

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You move because pairs of

muscles work together

• One end of the muscle attaches at

the end of a bone by a tendon

• The opposite end of the muscle

attaches to an adjacent bone

• Muscles always pull against the

opposite bone

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TENDON

SMOOTH MUSCLE

• Regulates blood pressure, digestion, and other internal functions
• Involuntary
• Ex: muscles in the stomach, bladder, blood vessels

Draw and label the smooth muscle in the circle

on your paper

© Getting Nerdy® , 2012 to present All rights reserved

CARDIAC MUSCLE

• Found only in the heart
• Involuntary
• Can beat independently of

input from the brain

• Striated (striped)

© Getting Nerdy® , 2012 to present All rights reserved

Draw and Label the
cardiac muscle in the
circle on your paper