Muscles3 Flashcards
Why are the smooth muscle doesn’t shorten or lengthen
The actin and myosin filaments arnt in a regular pattern (no sacromeres)
Where smooth muscle is found
Viscera, pupil of eye, hairs on body (etc)
Signal/impulse spreads in a controlled fashion to neighboring cells to produce a wave to propel food along
Peristalsis
Smooth muscle has internal _______, rather than being stimulated by our brain
Pacemakers
Smooth muscle also needs atp and Ca++, how effected in cows with milk fever
Bloat or slow calving
Hypertrophy
Increase in size of cells
Hyperplasia
Increase in number of cells
Which has more striations, cardiac or skeletal muscle?
Skeletal
What links muscle cells together in cardiac muscle
Intercalated disks
Chemical that slows down; or gives a regular heart beat at rest
Acetylcholine
Fight or flight hormone, speeds up heart rate
Epinephrine (adrenaline)
The heart has a ______ like smooth muscle, but it’s in a distinct location
Pacemaker
The hearts pacemaker is located where
The right atrium (sino-atrial or SA node)
