Ch. 10: Muscular Tissue

31 terms by lisanguyen93

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regulatory/contractile/structural

three kinds of muscle proteins

regulatory

proteins that switch the contraction process on and off

contractile

proteins that generate ofrce during contraction

myosin

functions as a motor protein which can achieve motion

myosin

convert ATP to energy of motion

myosin

thick filaments

actin

thin filaments

actin

provide a site where a myosin head can attach

structural

proteins that align the thick and thin filaments properly

titan/dystrophin

two types of structural proteins

titan

stabalize the position of myosin

dystrophin

links thin filaments to the sarcolemma

ATP hydrolysis/formation of cross-bridges/power stroke/detachment of myosin from actin

4 steps of the contraction cycle

ATP hydrolysis

step that reorients and energizes the myosin head

formation of cross-bridges

step of the contraction cycle where the myosin head attaches to the myosin-binding site on actin

power stroke

step where the crossbridges rotates, sliding the filaments

detachment of myosin from actin

step where the myosin head detaches from actin

action potentials

causes Ca++ to be released from the SR into the muscle cell

Ca++

moves tropomyosin away from the myosin-binding sites on actin allowing cross-bridges to form

Ca++ pumps

return Ca++ back to the SR quickly

length of sarcomeres

the forcefulness of muscle contraction depends on this

neuromuscular junction/synapse/synaptic cleft/neurotransmitter/synaptic vesicles/motor end plate

structures involved in the contraction process

neuromuscular junction

action potentials arise at the interface of the motor neuron and muscle fiber

synapse

where communication occurs between a somatic motor neuron and a muscle fiber

synaptic cleft

gap that seperates two cells

neurotransmitter

chemical released by the initial cell communicating with the second cell

synaptic vesicles

sacs suspended within the synaptic end bulb containing molecules of the neurotransmitter acetylcholine

motor end plate

the region of the muscle cell membrane opposite the synaptic end bulbs

release of ACh/activation of ACh receptors/production of muscle action potential/termination of ACh activity

nerve impulses elicit a muscle action potential in the following way

strabismus

crossed eyes

botulinum

blocks release of ACh from synaptic vesicles

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