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14 Cards in this Set
- Front
- Back
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Smooht muscle is not striated, actin and myosin are arranged ______, except for cardiac muscle.
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differently
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Does smooth muscle have toponin complex?
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no
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Skeletal muscle is stimulated by nerve impulses,,,, smooth muscle can be stimulated by???
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nerve, hormones, stretch...`
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Smooth muscle resting membrane potential is?
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50-60mV
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Physical arrangement of smooth muscle---
actin filaments attach to? |
dense bodies
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Calciums role in contraction: smooth muscle---
Calmodulin is a large?? |
regulatory protein similar to troponin
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Calmodulin-calcium complex activates??
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myosin light chain kinase
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MLCK phosphorylates the myosin.....
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regulatory chain
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Phosphatase is?
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an enzyme the dephosporylates regulatory chain.
-myosin is unable to bind actin |
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Neuromuscular junctions of smooth muscle-
Diffuse junctions? |
autonomic nerve fibers branch diffusely on top of sheets of muscle fibers unlike the highly structured NMF of skeletal fibers
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Contact Junctions?
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similar as diffuse junctions, much closer, therefore much faster eliciting contraction
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Neurotransmitter--
smooth muscle uses _______ or ________ in the NMJ. |
acetylcholine, norepinephrine
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Action Potentials: Smooth muscle-
Spike potentials, the large change in membrane potential during.... |
excitation, similar to skeletal muscle.
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Action potentials with plateaus--- Cardiac muscle cells, delayed repolarization leading to......
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prolonged contraction
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