skelatel n smooth muscles I Flashcards
where is skeletal muscle?
voluntary or involuntary?
attached to bone and supports the skeleton
voluntary
striated
where is smooth muscle?
voluntary or involuntary?
surrounds hollow cavities and tubes
unstriated and oinvolentary
what are the fuxns of muscle tissue
- motion
- motion of substances with in the body
- stabilization of body position and organ volume regulation
- thermogeneration (cardiac)
what substances does all 3 types of muscle help move in the body
blood
food
sperm
ova urine
what does muscle stabilize in the body and what organ volumes does it regulate
body posture and positions
-constant smooth muscle contraction blocks stomach empting and urine voiding
how does muscle contribute to body Temp
contraction releases heat (heart)
what 5 characteristics enable muscle to carry out its fxns and what is the roll of each?
excitability -property responding to stimuli producing an action
- Conductivity - action potential along plasma membrane
- Contractility the ability to shorten and contract (force n work)
- extensibility- ability to stretch
- elasticity- the ability to return to its original shape
skeletal muscles contract under the command of the
CNS
Axons (nerve fibers) penetrate muscle tissue to innervate
individual muscle fibers
what is a muscle fiber
muscle cell
what is a myofiber
parallel fibers of a muscle cell
what is a myofilament
thick and thin protein threads that makeup myofibrils
what is myosin and what is its stxr
thick myofiliments contractile protein
made of a tail n 2 globular heads
what are 3 the thin myofiliments
actin
tropomyosin
troponin
what is a sarcomere
basic contractile unit
