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16 Cards in this Set
- Front
- Back
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skeletal muscle; exception
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Voluntary forceful contraction
Exception: swallow reflex when food goes down esophagus |
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Cardiac Muscle
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heart, rhythmic endogenous beat, not under conscious ctrl, pacer
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Smooth muscle
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involuntary, levels of inherent tone, lines vessels and arteries, gut, pupil size ctrl, how thick limbs will be for fine focusing
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Three other contracting cells
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1) Myoepithelial cells
2) Myofibroblast 3) Pericyte |
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Skeletal myofiber shape
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Huge cylindrical diameter structures
-30 cm long -100 um diameter |
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Skeletal nuclei
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100s (fused form of individual precursor cells)
- reside peripherally, under sarcolemma |
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Skeletal
Hypertrophic (more size)? hyperplastic (more cells)? |
Yes, no
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Subtypes of skeletal myofibers?
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Type I - red myofibers
Type II - white myofibers |
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Cardiac myofiber shape
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25 um diameter
short Bifurcated - box car |
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Cardiac Nuclei
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one or 2 central nuclei
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Cardiac myofiber
Hypertrophic? Hyperplasia? |
Yes. No.
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Cardiac myofiber regeneration
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after heart attach, recruit silent blood brone bone marrow resting cells that invade myochondrium and give rise to new cardiac myofibers
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Subtypes of cardiac myofibers
What is special about one of them? |
atrial cardiac myofibers
endocrine function, release hormone from sarcoplasm called ANF ventricular cardiac myofiber |
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Smooth muscle shape
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fuciform (like canoe)
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Nuclei
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one central nucleus in widest part of canow
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Smooth
Hypertrophy? Hyperplasia? |
Yes, yes
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