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Dat bio
Muscles
Question | Answer |
---|---|
_______ soft flexible conn tissue needed for flexibility and firmness | cartilage |
___ is dense and composed of haversian system ( osteons) | Compact bone |
____ contain spiracles of yellow and red marrow | Spongy bone |
___ builds bone | osteoBlast |
______ destroys bone, bone resorption | osteoclast |
_______ ______ cartilage replace by bone | endochondral ossification |
_____ immovable joints | sutures |
___ join bone to bone | ligament |
___ join muscle to bone | tendon |
muscle cell aka | fiber |
______ membrane around individual muscle cell | endomysium |
membrane around the bundle of muscle cell | perimysium |
membrane around the muscle organ/ belly gaster | epimysium |
_______ bundles of filaments in the muscle fiber | myofibril |
Myofibrils contain contractile units | sarcomeres |
sarcomeres have _____ thin filaments and ___ are the thick filament | actin, myosin |
A band | dArk band, where thick and thin overlap is darkest |
I band | lIght band, only thin filament |
H zone | has only thick filaments, is the middle of A band |
during contraction only _____ are reduced | H zone and I bands |
neuromuscular junction | b/t nerve terminal and sarcolemma/ muscle fiber |
________ released at neuromusc junction | Ach, acetylcholine |
hows contraction initiated in a muscle | - nerve signal open Ca channels in synaptic bulb - ACh release in synaptic cleft -Ach binds to receptors on sarcolemma -surge of Na in and K out - voltage gate open cuzing action potential - sarcoplasmic reti release Ca -Ca causes contaction of sar |
all or none respose | stimuls must be at threshold value to elicit a contraction |
simple twitch | response of a single muscle fiber to a stimulus above threshold |
tetanus | stong and prolonged contraction in response to frequent stimuli |
smooth muscles perform | involuntary actions |
smooth muscles controlled by | Autonomic nervous system |
smooth muscle characteristics | 1 nucleus no striations |
cardiac muscle are | striated 1 or 2 nuclei |
_____ maintains oxygen supply in muscles, has high affinity to Oxygen | myoglobin |