What to think about….
 What
are the functions of
muscles?
 How do muscles work?
 What are some of the different
types of muscles?
 What happens to muscles based
upon their amount of use?
Muscles and bones are joined or
attached by tissue called
 It
is the tendons that allow
muscles to move the bones.
All body movement requires
muscles. What if we are not
moving?
 Even
sitting still we
are using muscles.
The heart beats, the
diaphragm causes us
to breathe, etc.
About how much of your body
weight is muscle?
 This
weight consists
of the over
muscles contained in
the human body.
3 Kinds of Muscle
 Each
functions differently.
Skeletal Muscle
C r anium
Face
Sternocleidomas toideus
Mandible
Trapezius
C lavicle
D eltoideus
Scapula
C oracobrachialis
Pectoralis major
Latis s imus dors i
 Called
skeletal muscle
because it attaches to
the skeleton and makes
it move. These are
strong muscles.
These
Serratus anterior
B rachialis
B iceps brachii
Triceps brachii
Pronator teres
R ectus abdominis
B rachioradialis
O bliquus externus abdominis
Flexor carpi radialis
(with an indication of the A poneuros is
Extens or carpi radialis longus
w hich extends from th is mus cle
Extens or digitorum communis
Extens or carpi radialis brevis
Flexor digitorum s ublimis
Pelvis
G lutaeus
medius
Sacr um
Tens or fas ciae
A bductor Pollicis long us
latae
Pectineus
Extens or pollicis brevis
to cover the R ectus abdominis )
U lna
Radius
A dductor longus
G racilis
Sartorius
R ector femoris
V as tus lateralis
V as tus medialis
B iceps femoris
Patella
Fibula
Peronaeus longus
G as trocnemius
Tibialis anterior
Extens or digitorum lon gus &
peronaeus tertius
Soleus
Tibia
M U SCLES, SU PERFIC IA L LA YER , AN TER IO R VIEW
are voluntary muscles.
Another name for skeletal muscle
is striated muscle.
Cardiac Muscle
 This
is a kind of strong muscle
out of which the heart is made.
 Cardiac muscle can work
continuously for a long period of
time without getting tired.
 Cardiac muscle is involuntary.
Smooth Muscle
 These
are muscles that line
places like the digestive tract.
 These weak muscles contract
and relax to create peristalsis.
 They are also involuntary.
Controlled vs. Automatic
-Muscles that you
can control.
-Muscles that you
can’t control.
How do muscles work?
 Muscles
and
work by
.
Skeletal muscles make us
move. However, muscles
are only capable of one
type of force.
Since muscles can only pull and
not push, how does this effect the
way they work in the body?
 The
muscles have
to work in pairs.
One muscle of a
pair bends a joint,
while the other
straightens it back
out.
Tricep
Bicep
•When the bicep contracts and the
triceps relaxes, the arm bends.
•When the Tricep contracts and the
bicep relaxes the arm straightens.
 When
you don’t use your muscles
they become
and
.
Unused
muscle
cells actually
become smaller if
not used regularly.
But, if used regularly, they
become larger and
stronger.
Of course, the most important
muscle in the body is the
 How
does a
strong heart
benefit you?
It works more efficiently. This
will give you more energy and
help you live longer.
1. Which of the following is not a
kind of muscle?
 A.
Striated
 B. Tendon
 C. Cardiac
 D. Smooth
2. What attaches muscles to the
bones?
 A.
Striations
 B. Tendons
 C. Diaphragms
 D. Cardiacs
3. Which muscles are
responsible for peristalsis?
 A.
Tendons
 B. Skeletal
 C. Cardiac
 D. Smooth
4. Which muscles are
responsible for your ability to
move around?
 A.
Tendon
 B. Smooth
 C. Cardiac
 D. Skeletal
5. The stomach is surround by
which type of muscle?
 A.
Striated
 B. Cardiac
 C. Smooth
 D. Tendon
6. Which of these is cardiac
muscle associated?
 A.
Heart
 B. Skeleton
 C. Tendons
 D. Digestive System
7. What happens to muscles that
get used regularly?
 A.
Get flabby
 B. Grow larger
 C. Become weaker
 D. All of the above
8. What kind of muscle is the
heart?
 A.
Involuntary
 B. Voluntary
 C. Skeletal
 D. Smooth
9. When muscles work together
to make the body move, they
work in ____________.
10. When one muscle contracts
then another is _____________.