9: Smooth Muscle Contraction Flashcards
1
Q
Varicosites
A
regions of swelling in smooth muscle that are synaptic contacts filled with NTs
2
Q
What NTs are used in smooth muscle?
A
ACh, NE, E
3
Q
Caveolae
A
shallow depressions of the sarcolemma found in smooth muscle
4
Q
Phasic smooth muscle
A
single-unit, only a few fibers with direct synaptic input, have gap junctions, activated by neurons, hormones, or stretch
5
Q
Tonic smooth muscle
A
multiunit, each fiber with synaptic input, not activated by stretch
6
Q
What activates ligand-gated Ca+2 channels that allow Ca+2 to be released from the SR?
A
inositol triphosphate
7
Q
What does Ca+2 bind to causing a conformational change?
A
calmodulin
8
Q
Mysoin light chain kinase
A
activated by Ca+2-calmodulin binding to myosin kinase
