The Muscular System A. 1.

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Date
Class
Lesson Outline
LESSON 2
The Muscular System
A. Functions of the Muscular System
1. Movement is an important function of
. They
are also important for protection, stability, and maintaining
body
.
2. A muscle is made of strong tissue that can
in an
orderly way.
3. Muscles that are attached to
enable your skeleton
to move.
a. Muscles that are attached to bones support the body and help
it
b.
.
work with muscles to help keep joints in place when
the body moves.
4. Some muscles that are not attached to bone cause
and
to move throughout the body. They also make the
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beat and hair stand on end.
5. Muscles protect the body by acting like a layer of
for
bones and internal organs.
6.
is when muscles contract rapidly and change
chemical energy to heat energy. The heat energy helps raise your
body’s
.
B. Types of Muscles
1. Muscles that are attached to bones are
called
2. Skeletal muscles work by
3.
. They are also
, muscles that are under conscious control.
on bones.
increases the size of muscle cells and makes the entire
muscle larger and stronger.
4.
Structure and Movement
cannot be consciously controlled.
27
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Lesson Outline continued
5.
are involuntary muscles named for their smooth
appearance.
a. Contraction of smooth muscles in the
helps control
the movement of blood through vessels.
b. Contraction of smooth muscles in the stomach moves
through the digestive tract.
6.
are involuntary muscles located only in the heart.
They pump blood through your heart and through
the rest of the body.
to
C. Healthy Muscles
1. Muscles benefit from a healthy
. Muscles get
from food.
2.
helps keep muscles healthy.
D. The Muscular System and Homeostasis
1. Muscle contractions convert chemical energy to heat energy and keep the
body
.
muscles of the heart help maintain
blood. The blood carries
28
. The cardiac
by pumping more
to the cells.
Structure and Movement
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
2. During exercise, muscle cells need more