Muscles

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22 Terms

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Attrophy
Redcution in size/tone/power of muscle
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Fast Twitch
* Contract quickly
* Rapid generation of power
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Slow Twitch
* Contract slowly
* Resistant to fatigue
* Efficient use of oxygen
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How do you contract muscles?

1. Myosin head binds to actin (needs ATP, normally blocked by tropanin and tropomyosin, Calcium binds to those)
2. Actin is pulled inwards by myosin head
3. Myosin head releases (needs ATP)
4. Myosin head reattaches
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Structure of Skeletal
* Myofilaments (actin, myosin)
* Sacromere
* Myofibril
* Fibre
* Bundle
* Muscle
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Antagonistic
For the action of each muscle, there is another muscle that has the opposite action
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Skeletal Function
* Movement of bone
* Regulate body temperature
* Stabilize joints
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Skeletal Control
Voluntary
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Cardiac Control
Involuntary
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Smooth Control
Involuntary
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Arrangement of Skeletal
Fibres
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Arrangement of Cardiac
Branched
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Arrangement of Smooth
* Parallel lines
* Sheets
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Description of Skeletal Cells
* Tubular
* Striated
* Many nuclei
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Description of Cardiac Cells
* Tubular
* Striated
* One nucleus
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Description of Smooth Cells
* Long
* Tapered at ends
* One nucleus
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Location of Skeletal
Attached to bone
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Location of Cardiac
Heart
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Location of Smooth
* Intestines
* Blood Vessels
* Iris
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Relax
Passive state
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Contract
* Shorten
* Work is done
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Function of Muscles
* Enable of movement
* Convert chemical energy into kinetic energy