Question | Answer |
which muscle has intercerlated discs? | cardiac |
where is cardiac muscle found? | the heart |
which 2 muscles can contract w/o nervous system stimulation? | cardiac and smooth muscle |
___ and __ muscle is involuntary | cardiac and smooth |
which 2 muscles are striated? | cardiac and skeletal |
smooth muscle is found in: | walls of hollow organs (stomach, urinary bladder, etc) |
___ muscle is the only voluntary muscle | skeletal |
skeletal muscles attach to: | bones or skin |
muscle functions include: | produce heat, movement of bones/fluid, maintaining posture & stablizing joints |
what are the 4 characteristics of muscle tissue? | excitability, contractility, extensibility and elasticity |
excitability has the ability to: | receive & respond to stimuli |
contractility has the ability to: | shorten forcibly when stimulated |
extensibility has the ability to: | stretch |
elasticity has the ability to: | recoil to resting length |
skeletal muscles attach in what 2 places? | insertion and origin |
insertion | movable bone |
origin | immovable bone |
muscles are covered by: | epimysium |
fascicles are covered by: | perimysium |
what is a fascicle? | a portion of the muscle |
muscle fibers are covered by: | endomysium |
sarcolemma is the __ of the muscle fiber | plasma membrane |
sarcoplasm is the ___ of the muscle fiber | cytoplasm |
what 2 structures of the muscle fiber help regulate muscle contraction? | T-tubules and sarcoplasmic reticulum |
myofibrils are composed of : | myofilaments |
what is a sarcomere? | a segment of a myofribil |
what are the 2 types of myofilaments? | actin and myosin |
actin are the __ molecules found in myofilaments | thin |
myosin are the __ molecules found in myofilaments | thick |