aim: why do we need a muscular system?. do now: explain how puppets work hw: identify the 3 types of...
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AIM: Why do we need a Muscular system?
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DO NOW: Explain how puppets work
HW: Identify the 3 types of muscle and provide examples
of each
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LocomotionMovement by contracting (shortening) and relaxing
(expanding) muscles
The Muscular System
A body system of muscles that enable the
organism to perform the life
activity of
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Approximately 40% of your body weight is in muscles
You have over 630 muscles that move you. Muscles can't push. They pull.
Muscles often work in pairs so that they can pull in different or opposite directions.
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•You have over 30 facial muscles
•Eye muscles are the busiest muscles in the body. Scientists estimate they may move more than 100,000 times a day!
•The largest muscle in the body is the gluteus maximus muscle in the buttocks.
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Parts of the Muscular system
1. Muscles organs that contract
& relax to move body parts
Two types:1.Voluntary2.Involuntary
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Voluntarymuscles
Muscles that you are able to control
Involuntarymuscles
Muscles that you are NOT able to
control
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2. Tendons connective tissue
that connects muscle to bone
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Aim: How are our muscles different?
Do Now: Read Contractile Obligation and answer these
questionsHW: textbook page 505 copy and
complete
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3 Groups ofMUSCLES
1. Skeletal Muscle
Any muscle that is
attached to the skeleton,Voluntary in
action
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Skeletal muscle is striated
Striations appears as stripes on the tissue
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2. SmoothMuscle
Muscle that is found in organs,
Involuntary in action
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3. CardiacMuscle
Muscle that is found only
in the heart,Involuntary in
action
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Contains striations
Fibers are branched
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A
B
C
Aim: How do our muscles work?Do Now:
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Muscles work by Working in pairs
One contracts while the other relaxes
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How domuscleschange
Become larger or smaller
depending on usage.
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More exercise causes muscles to be larger in size
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Less exercise causes muscles to be smaller in size
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Gregg Valentine Before (@ 20 yrs old)
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After (Steroid use)
24in arms
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In the Gym
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27in. arms
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AFTER THEY EXPLODED DUE TO BLOOD CLOTS
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He went from This to This!
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Summary
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How do muscles do “all this work”?
•Use energy produced from the life process of ________________•The energy is produced in the __________________
AEROBIC RESPIRATION
MITOCHONDRIA
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Why do our muscles get tired?
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If you run out of oxygen your body
temporarily switches to Anaerobic Respiration called fermentation
Which produces lactic acid
Lactic acid build up causes muscle fatigue/ muscle cramping
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Muscle Fatigue