Transcript Bones, Muscles, and Skin

Bones, Muscles, and Skin - The Muscular System
Bellringer:
Are bones dead or alive? Explain your
answer.
Bones, Muscles, and Skin - The Muscular System
Types of Muscle
Q. How does skeletal muscle help my body move?
A.
Q. Where is smooth muscle found?
A.
Bones, Muscles, and Skin - The Muscular System
Types of Muscle
Involuntary muscles are not under your conscious
control. Involuntary muscles are responsible for such
essential activities as breathing and digesting food.
Voluntary muscles are under your conscious control.
Smiling, turning a page in a book, and getting out of your
chair when the bell rings are all actions controlled by
voluntary muscles.
Bones, Muscles, and Skin - The Muscular System
Types of Muscle
Muscles Location in
Body
Voluntary or
Involuntary
Striated or
Not
Skeletal
Attached to
bones of
skeleton
Voluntary
Striated
Smooth
Inside many
internal organs
Only in heart
Involuntary
Not striated
Involuntary
Striated
Cardiac
Bones, Muscles, and Skin - The Muscular System
Skeletal Muscles
A tendon is a strong connective
tissue that attaches muscle to
bone.
Skeletal muscles react very
quickly and tire quickly.
Consider the swimmer…
Bones, Muscles, and Skin - The Muscular System
Smooth Muscles
Smooth muscles are found
inside of many internal organs,
such as the stomach and blood
vessels.
Smooth muscles are not
striated. Behaving differently
than skeletal muscles, smooth
muscles react more slowly and
tire more slowly.
Bones, Muscles, and Skin - The Muscular System
Cardiac Muscles
Similar to smooth muscle in that it is involuntary.
Similar to skeletal muscle in that it is striated.
Cardiac muscle does not get tired.
Consider those repeated contractions we call heartbeats…
Bones, Muscles, and Skin - The Muscular System
Muscles at Work
Muscles do their work by contracting, becoming shorter
and thicker. Muscle cells contract when they receive
messages from the nervous system.
Because muscle cells can only contract, not extend,
skeletal muscles must work in pairs. While one muscle
contracts, the other muscle in the pair relaxes to its
original length.
Bones, Muscles, and Skin - The Muscular System
Muscles at Work
When exercising to build muscular strength, why is it
important to exercise both muscles in a muscle pair
equally?
Because paired muscles must work together, and
exercise makes individual muscle cells grow in size,
exercising both muscles in a pair will make them grow
equally strong.
Bones, Muscles, and Skin - The Muscular System
Skeletal Muscles
Click the Video button to watch a movie
about skeletal muscles.
Bones, Muscles, and Skin - The Muscular System
More on Muscle Types
Click the PHSchool.com button for an activity
about muscle types.
Bones, Muscles, and Skin
Graphic Organizer
Muscles
can be
Smooth
muscles
Involuntary
muscles
Voluntary
muscles
include
include
Cardiac
muscles
Skeletal
muscles