The Muscular System Ch. 15.3
Smooth Muscle is found in the digestive
tract and the walls of blood vessels.
 Cardiac Muscle is found only in the heart.
 Skeletal Muscle is attached to the bones
and helps you move. It also helps protect
your inner organs.

2 Types of Muscle Action
Muscle action that is under your control
is voluntary.
 Muscle action that is not under your
control is involuntary.

Aerobic exercise is exercise like
cycling or running that improves
your heart’s ability to pump oxygen
rich blood efficiently through your
body
 Resistance exercise is working
against the weight of an object to
build muscle strength and size (push
ups, weightlifting)

Flexor- a muscle that bends part of your
body
 Extensor- a muscle that straightens part
of your body
 Tendon- tissue that connects skeletal
muscle to bones
 Tendinitis- a condition in which the
tendon becomes inflamed
