Term
| basic characteristics of muscles 1. |
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Definition
electrial excitability
production of action potentials across the cellular membrane |
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Term
| 2. basic characteristcs of muscles |
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Definition
contractility
tension is created as muscle fibers shorten ( contract) |
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Term
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Definition
extensibility- ability of muscle fibers to be stretched with out damage
and still being able to contract while stretched |
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Term
| 4. characteristc of muscle |
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Definition
| elasticity- ability of muscle fibers to spring back after contraction/extension |
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Term
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Definition
motor end plate
received impulses from a motor neuron
ach receptors |
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Term
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Definition
cytoplasm, contains mitochondria which produce atp
lots of nuceli due to fusion of myoblasts
allows protein synthesis |
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Term
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Definition
little threads
contain protein filaments(myofilaments) |
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Term
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Definition
protein myosin( contractile) contain myosin tails point to filament midline(m-line)
forms shaft of filament
myosin heads
spiral around filament
point towards thinfilament |
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Term
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Definition
| act as cross bridgesk for attachment of thin filaments during contraction |
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Term
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Definition
| actin protein contain myosin binding sites to which myosin heads (cross bridges) can attach |
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Term
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Definition
| covers myosin binding site of actin during muscle relaxation |
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Term
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Definition
| hold tropomyosin in place |
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Term
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Definition
anchors thick filaments to z discs
assist in recovery to resting postion |
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Term
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Definition
forms the m line on sarcomere
connects thick filaments |
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Term
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Definition
| anchors thin filaments to z discs |
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Term
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Definition
| attachs thin filaments to sacrolemma |
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Term
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Definition
carry impulse (action potential) to skeletal muscle from cns
stimulates muscle contraction |
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Term
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Definition
| motor neuron and all myofibrils innervated by it used for precise movements large body movements |
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Term
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Definition
| communication *synapse between motor neuron and myofiber |
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Term
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Definition
| branced ends of axon of somatic motor neuron |
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Term
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Definition
| with in synaptic end bulbs contain ach |
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Term
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Definition
| space between axon and myofiber |
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Term
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Definition
portion of muscle sacrolemma
contains ach receptors on integral proteins
ligand gated ion channels |
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Term
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Definition
stores calcium released through calcium release channels
contains active calcium transport pump
actively pulls calcium into sr during relaxation |
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Term
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Definition
by potassium gates opening and potassium rushing to the sacrolemma
ach is broken down by ache
calcium moves from sacroplasm to sr
myosin binding sites are covered again |
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