anatomy unit 5 skeletal and muscular systems muscle types notes
TRANSCRIPT
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ANATOMY
Unit 5 Notes:Muscle Parts
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(1) Types of Muscle
•Skeletal
•Cardiac
•Smooth
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Cardiac Muscle
Skeletal Muscle
Smooth Muscle
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(2) Skeletal Muscle• Type of Movement:
– Voluntary– Allows overall body mobility– Contracts fast w/great force, tires fast also
• Location:– On top of bones & connecting them
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(3) Cardiac Muscle• Types of Movement:
– Involuntary– Steady, consistent movement– Heartbeat (rate gauged by nervous system)
• Location:– heart
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(4) Smooth Muscle• Type of Movement:
– Involuntary– Slower, yet consistent movement– Forces fluids & solids through channels
• Location:– Digestive & excretive organs– Respiratory passageways
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(5) Muscle Function• Produce movement
– Bones = attachment points– Internal organs (move nutrients, waste, etc.)
• Maintain posture– Unique to Bipedalism
• Stabilize joints– Allows for wider range of movement and use of
force
• Generate heat– During contraction
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(6) Levels of Organization
• Muscle (whole organ)• Fascicle (portion of muscle)• Muscle Fiber (single muscle cell)• Myofibril (muscle cell organelle)• Sarcomere (portion of myofibril)• Myofilaments—Actin + Myosin
(part of sarcomere)
Macroscopic
Microscopic
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Muscle (organ)Fascicle
Muscle Fiber (cell)
Muscle Fiber (with many nuclei)
Myofibril
Sarcomere
Thin Filament (actin)
Thick Filament (myosin)
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