The Muscular System ch.17 s.2

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The Muscular Systemch.17 s.2
Oh wow, Im so embarrassedeveryone can see me
naked!
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Interesting Facts about muscles

• Muscle A tissue composed of fibers capable of
  contracting to effect bodily movement
• There are about 650 muscles in the human body.
• Every person has a unique tongue print.
• Hiccups are spasm of the diaphragm.

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A Muscle is an organ that can relax and contract,
and provides the force to move your body parts.

• 1. Voluntary muscles you are able to control
• ex. Biceps, quadriceps, etc.
• 2. Involuntary muscles you cannot control
• ex. heart

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There are three types of muscle tissue.
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• 1. Skeletal muscles move bones
• a. Most common type of muscle
• b. Tendons are thick bands of tissue that attach
  muscle to bones.
• c. Voluntary muscles
• d. Contract quickly and tire more easily
• e. Look striped, or striated

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• 2. Smooth musclesfound in internal organs
• a. Example Intestines
• b. Smooth muscles are involuntary muscles.
• c. Contract and relax slowly

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• 3. Cardiac muscle
• a. found only in the heart
• b. Cardiac muscle is striated, like skeletal
  muscle.

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Muscle Structure

• Composed of individual cells called fibers
• Long and thread-like shape
• Cells held together in bundles by connective
  tissue
• Muscle covered by fascia is sheath of
  connective tissue
• Supporting tissues merge to form tendon
• Tendon attaches muscle to bone

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You move because pairs of muscles work together.

• 1. When one muscle of a pair contracts, the other
  relaxes.
• 2. Muscles always pull.
• 3. Over time, muscles can become larger or
  smaller, depending on whether or not they are
  used.
• 4. Blood carries energy-rich molecules to the
  muscles so they can do their work.

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DISCUSSION QUESTION

• What are some actions of involuntary muscles?
• Blood pumping through blood vessels, food moving
  through the digestive system, the pumping of the
  heart, or blinking are all activities caused by
  involuntary muscles.

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Superficial Muscles, Anterior View
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Superficial Muscles, Posterior View
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• Toned muscles vs. bulky muscles
• 2 ways to lift weights

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Hold two books above your head for as long as you
can

• How is the muscle able to do this? Where does it
  get its energy from?
• When youre exercising, how does this process
  change?

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Origins and Insertions
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Muscle Action

• Muscles work in pairs at joints to produce
  movement
• Prime mover contraction
• Antagonist relaxation
• Point of origin muscle attachment point to
  stable part of skeleton
• Point of insertion muscle attachment point to
  moving part of skeleton

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Why do I need tendons?

• Tendons attach my muscles to my bone helping my
  body move.
• Feel your tendon right above your heel in
  the back of your leg.
• This is the thickest tendon in your body.

Try This...
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One way to keep my muscles strong

• Eat foods from the meat group every day. They
  are high in protein which helps to build strong
  muscles.
• Name some foods that are high in protein.

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Another way to keep strong muscles

• Exercise every day.
• What are some things you can do every day to help
  keep your muscular system healthy?