Smooth muscle Flashcards
main function of smooth muscle
regualte and promote movement of fluids, expel contents of organs, move visceral structures
high or low metabolic economy
high–little energy consumption
size of smooth muscle cells
small cells–very small structures (blood vessels)
smooth muscles
not discrete cells like skeletal – components of larger organs
smooth muscle locations
esophagus, vessels, urinary tract, digestive tract, airway
fast or slow cross-bridging
slow
smooth muscle functional types
single unit–all contract as one unit–gap junctions connect (fast electrical communication)
multi unit–lots of autonomic innervation for each cell
no T tubules
in smooth muscle
muscles of iris
smooth muscle–circular (parasymp) and radial (symp)
smooth muscle stretch
stretches well (bladder, uterus, stomach)
Ca binds to
calmodulin in smooth muscle–dif then skeletal and cardiac–ATP not as important
calmodulin CaM
most important player in smooth muscle contraction
smooth muscle in airway
asthma–increased airway smooth muscle–albuteral relaxes
Mediates smooth muscle contraction
Calmodulin
Smooth muscles areV_______
Viscoelastic
