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What are the three categories of muscle?
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How are muscle cells formed during development?
By fusion of undifferentiated, mononucleated cells
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What is a myoblast?
A single multinucleated, cylindrical cell
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What is muscle made of?
Muscle fibers bound by connective tissue
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How is skeletal muscle most easily visually characterized?
By striations
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What type of muscle has no distinct banding pattern?
Smooth muscle
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What type of muscle is spindle shaped with no distinct banding pattern?
Smooth muscle
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Describe the visual characteristics of smooth muscle:
Spindle shaped with no distinct banding pattern
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What are the five major features of skeletal muscle (4)?
- Multinucleated
- Many mitochondria
- Transverse Tubules
- Myofibrils/Sarcomeres
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What type of muscle is multinucleated, has many mitochondria, contains transverse tubules and has distinct myofibrils and sarcomeres?
Skeletal muscle
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What is the Sarcolemma?
The plasma membrane of skeletal muscle
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What is the Sarcoplasm?
The cytoplasm of skeletal muscle
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What is Sarcoplasmic reticulum?
Smooth endoplasmic reticulum of skeletal muscle
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What is the term for the plasma membrane of skeletal muscle?
Sarcolemma
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What gives skeletal muscles their characteristic striated appearance?
Myofibrils
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What are myofibrils composed of?
Actin and myosin
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Is Actin thick or thin?
Thin
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Is Myosin thick or thin?
Thick
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Which is thin, Actin or Myosin?
Actin
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Which is Thick, Actin or Myosin?
Myosin
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What are the three major components of the thin filament?
 - Actin
- Tropomyosin
- Tropnin
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What is the term for the small “feet” on the Myosin filament?
Cross-bridge
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What is the A band?
- The myosin (dark)
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What is the M line?
- The midline between actin filaments in the center of myosin filaments
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What is the Z line?
- Center of Actin filaments, between Myosin filaments
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What is the I band?
- The light colored band between A bands
- All actin, no myosin
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