Muscular

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Muscular System
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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?

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Muscles and bones are joined or attached by
tissue called
tendons

• It is the tendons that allow muscles to move the
  bones.

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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.

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About how much of your body weight is muscle?
50

• This weight consists of the over
  muscles contained in the human body.

650
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3 Kinds of Muscle
Smooth
Skeletal
Cardiac

• Each functions differently.

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Skeletal Muscle

• Called skeletal muscle because it attaches to the
  skeleton and makes it move. These are strong
  muscles.

• These are voluntary muscles.
• Another name for skeletal muscle is striated
  muscle.

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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.

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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.

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Controlled vs. Automatic
Voluntary Muscles
-Muscles that you can control.
Involuntary Muscles
-Muscles that you cant control.
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How do muscles work?
contracting

• Muscles work by and
  .

relaxing
Skeletal muscles make us move. However, muscles
are only capable of one type of force.
pulling
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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.

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Tricep
Bicep

• When the bicep contracts and the triceps relaxes,
  the arm bends.

• When the Tricep contracts and the bicep relaxes
  the arm straightens.

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• When you dont use your muscles they become
  and
• .

weak
flabby

• Unused muscle cells actually become smaller if
  not used regularly.

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But, if used regularly, they become larger and
stronger.
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Of course, the most important muscle in the body
is the
Heart

• How does a strong heart benefit you?

It works more efficiently. This will give you
more energy and help you live longer.
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1. Which of the following is not a kind of
muscle?

• A. Striated
• B. Tendon
• C. Cardiac
• D. Smooth

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2. What attaches muscles to the bones?

• A. Striations
• B. Tendons
• C. Diaphragms
• D. Cardiacs

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3. Which muscles are responsible for peristalsis?

• A. Tendons
• B. Skeletal
• C. Cardiac
• D. Smooth

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4. Which muscles are responsible for your
ability to move around?

• A. Tendon
• B. Smooth
• C. Cardiac
• D. Skeletal

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5. The stomach is surround by which type of
muscle?

• A. Striated
• B. Cardiac
• C. Smooth
• D. Tendon

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6. Which of these is cardiac muscle associated?

• A. Heart
• B. Skeleton
• C. Tendons
• D. Digestive System

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7. What happens to muscles that get used
regularly?

• A. Get flabby
• B. Grow larger
• C. Become weaker
• D. All of the above

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8. What kind of muscle is the heart?

• A. Involuntary
• B. Voluntary
• C. Skeletal
• D. Smooth

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9. When muscles work together to make the body
move, they work in ____________.
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10. When one muscle contracts then another is
_____________.