Term
| What do we call the pm, cytoplasm, and ER for muscle cells? |
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Definition
| -The sarcolemma, the sarcoplasm, and the sarcoplasmic reticulum |
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Term
| Describe a skeletal muscle fiber? |
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Definition
| -Basically one elongated, multinucleated cell |
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Term
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Definition
-A group of muscle fibers that all contract together because they are supplied by one nerve fiber
-More motor units = more control |
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Term
| What is the name for muscle stretch receptors? |
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Definition
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Term
| Explain the organization of muscle tissue as far as the coverings and names for units? |
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Definition
-First you have the MUSCLE FIBER surrounded by the ENDOMYSIUM
-Then a bunch of fibers form bundles called FASCICULI which are covered in PERIMYSIUM
-All of these form the MUCLE which is covered in the EPIMYSIUM
-In order, it is ENDO, PERI, EPI |
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Term
| What does a sarcamere go to and from? |
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Definition
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Term
| What is the A band? How does it look microscopically? |
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Definition
-The area occupied by the thick filaments
-A bands are the dark bands |
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Term
| What is the I band? Microscopically how does it look? |
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Definition
-The area between the thick filament band
-It shrinks during contraction (unlike the A band)
-The I band looks light |
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Term
| What composes the thick and thin filaments? What holds them each in place? What is the motor protein? |
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Definition
-The thick is myosin and the thin is actin
-They are held by the M and Z lines, respectively
-The motor protein connecting them is actually the myosin, which has projectile heads |
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Term
| Describe a smooth muscle cell? |
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Definition
-Only has one nucleus and has a sort of disorganized system of thick and thin filaments connected by "densities" that acts to make the cell more spherical
-The muscle fibers are bound together in irregular branching fasciculi which vary from tissue to tissue |
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Term
| Describe a cardiac muscle cell's appearance? |
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Definition
-Usually have one, and sometimes two nuclei
-It is striated |
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