Stack #20489
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| job of tropomyosin | covers actin's binding site
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| has a myosin binding site | actin
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| have heads (crossbridges) | myosin
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| holds tropomyosin in place | troponin
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| covers binding site of actin | tropomyosin
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| excitation-contraction coupling | receiving and propagating a stimulus to contraction
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| the contraction cycle | when stimulated, crossbridges attach to myosin binding site on actin
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| job of crossbridges | act like tiny ratchets to propel thin filaments toward center of sarcomere
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| location of sarcomere | Z line to Z line of myofibril
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| NMJ | area f contact between neuron and sarcolemma
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| synapse | where nerve cell communicates with other cell through release of Ach
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| synaptic gap | space between synaptic terminal and sarcolemma
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| synaptic end bulbs | expanded ends of neuron that fit into motor end plate
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| motor end plate | area on sarcolemma where acetylcholine receptors are found
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| Acetylcholine (Ach) | neurotransmitter (chemical messenger) released at the NMJ
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| When Ach binds to receptors at motor end plate, muscle becomes | more permeable to sodium
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| ATP | the main energy currency in living cells; usd to transfer the chemical energy needed for metabolic reactions
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| where does the energy for muscular activity come from? | ATP
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| ATP is needed for what in muscle metabolism? | energy for conractions, to detach cross bridges, to pump calcium ions back into the SR
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| in order for muscle contractions to continue, ___ needs to be regenerated | ATP
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| where is ATP made? | mitochondria
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| the SR stores this | Calcium
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| at rest, active sites of actin are covered by | tropomyosin
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| the ___contains vesicles filled w/ Ach | synaptic end bulb
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| contains receptors for Ach | motor end plate
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| at rest, tropomyosin held in place by | troponin
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| synaptic cleft | space between end bulb and motor end plate; where Ach is released for diffusion
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| motor unit | single neuron and all the muscle fibers it controls
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| isotonic | muscle changes in length as tension rises
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| isometric | does not change lengthen as tension rises
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Created by:
ShellyA&P
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