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Cards In This Set
| Front | Back |
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What are the characteristics of smooth m
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No striations
Involuntary Visceral |
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What are the characteristics of cardiac m
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Striated
Involuntary Cardiac |
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What is the location of smooth m
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Hollow organs
|
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What are ex of hollow organs
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Vessels
Gastrointestinal organs (GI) Respiratory passages Glands Inside the eye (pupil and lens) Arrector pili to hair follicles |
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Each of the hollow organs are different in what
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Fiber arrangement
Innervation Response to stimuli |
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What are 2 general types of smooth m
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Single unit
Multiunit |
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What is single unit
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All united into one functioning group, most
|
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What is multiunit
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More like skeletal
Independent cells Individually innervated (ANS) Recruitment for strength, eye, large airways & arteries, arrector pili |
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What is the characteristics of single unit
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Thick & thin filaments less regularly arranged, longer, spiral through cell
Ca2+ still signal for contraction Cells connected by gap junctions Pacemaker |
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What is the characteristics of multiunit
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Thick & thin filaments less regularly arranged, longer, spiral through cell
Ca2+ still signal for contraction |
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What is different about the Ca2+ signal for contraction in single unit and multiunit
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Less SR and no troponin so Ca2+ works differently, some from extracellular
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How does Ca2+ work differently in single unit and multiunit
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Activates calmodulin and kinase
Phosphorelates myosin heads and sliding occurs Contraction ends when Ca2+ drops and P removed Contraction much slower but can last much longer Much less energy used than skeletal |
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What type of synapse is in gap junctions
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Electrical synapse
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What is pacemakers
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Some can self-depolarize
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How many layers are in single-unit of smooth mm and how is it organized
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2 layers of m with opposite fiber directions
Peristalsis |
