med phys skeletal and smooth muscle Flashcards
1
Q
influx of which ion allows spontaneous depolarization to occur without a stimulus?
A
Na+
2
Q
what tissues does spontaneous rhythmicity occur?
A
CNS (control of breathing), Heart, Smooth muscle (peristalsis).
3
Q
what is defined as the cell membrane of a muscle fiber and the outer thin polysaccharide/collagen coat?
A
sarcolemma
4
Q
what is a myofibril?
A
functional unit of a muscle cell
5
Q
what is a sarcomere?
A
the portion of myofibril between two z discs.
6
Q
what is a muscle fasciculus?
A
bundle of muscle fibers
