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Transcript
Congress Middle School
Pre-Medical Magnet
Program
2008
Presented by: Diana Herec, Medical Magnet Coordinator
Human Anatomy & Physiology
The Muscular System




Responsible for bodily movement
Includes the voluntary muscles of
the body
About 700 muscles in the human
body
Vary greatly in size
Muscle Action
Muscle action depends on its position
with the joint it works on
Limb movement requires the
teamwork of several muscles
Muscles contract when activated
Muscle Contraction
If the force of a muscle contraction is
greater than the force resisting it,
the contraction is known as
Isotonic Contraction
muscle contraction continued…
If resistance to contraction is equal to
the force, the muscle will not
contract, known as:
Isometric Contraction
Skeletal Muscle



Most prominent type of muscle in
the body
May account for up to 60% body
mass
It is attached to bones at both ends
by tendons
Skeletal Muscle continued…
Skeletal muscle is under constant
control, therefore, known as:
Voluntary Muscle
Just below the surface of the skin
The muscles and
skeleton
are responsible for
an individual’s
Physique
Muscle Types
Classified by shape:


Parallel fibers
Oblique fibers
Shape and arrangement of
fibers reflect muscle function
Pennate Muscles

Have feather-like
appearance and
fibers run
obliquely down to
the tendon

Some spiral
muscles have the
capacity to turn
half a rotation
between their
attachments

Others twist
around a bone
In the common
spindle-shaped
muscles, all fibers
run from one
tendon to another
Circular Muscles

Fibers of circular
muscles are
arranged in
concentric circles

Muscles consist of bundles of fibers
that can be organized in different
ways, according to the function of
the muscle
Muscles You Will Need To Know
1. Temporalis
2. Masseter
4. Sternocleidomastoid
5. Pectoralis Major
6. Serratus Anterior
7. External Obliques
24. Rectus Abdominus
27. Biceps
28. Deltoid
29. Trapezius
32. Frontalis
Name 1,2, 4, 5, 6, 7, 24, 27, 28, 29, 32
1. Temporalis
2. Masseter
4. Sternocleidomastoid
5. Pectoralis Major
6. Serratus Anterior
7. External Obliques
24. Rectus Abdominus
27. Biceps
28. Deltoid
29. Trapezius
32. Frontalis
You Will Need to Know
14. Adductor Magnus
15. Sartorius
17. Soleus
18. Gastrocnemius
20.Tibialis Anterior
21. Quadriceps
Name #14, 15, 17, 18, 20, 21
14. Adductor Magnus
15. Sartorius
17. Soleus
18. Gastrocnemius
20.Tibialis Anterior
21. Quadriceps
You Will Need to Know
2. Trapezius
3. Deltoid
4. Latissimus Dorsi
7. Gluteus Maximus
9. Gastronemius
11. Soleus
15-17 Hamstrings
22. Tricep
Name #2, 3, 4, 7, 9, 11, 15-17, 22
2. Trapezius
3. Deltoid
4. Latissimus Dorsi
7. Gluteus Maximus
9. Gastronemius
11. Soleus
15-17 Hamstrings
22. Tricep