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77 lines
1.2 KiB
77 lines
1.2 KiB
# Sliding Filament Theory
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acetocolene and neurotransmitters and muscle movement
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(causes muscle contraction here)
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## actin and myosin - the thick and thin filaments
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the filaments that do the work
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excitation contraciton coupling
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myosin connects and pulls
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**myosin pulls**
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myosin head is where the it binds
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it keeps going as long it has requirements met
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### Step 1
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excitation
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it has depolorization of the membrane
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### Step 2
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excitation
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propocation into a t-tubule
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- leads from the muscle fiber(cell) to inside sarcoplasmic reticulum (sr)
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sarco is calcium storage for muscles
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### Step 3
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excitation
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releases calcium once the sarco is excited/depolarized
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### Step 4
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excotation
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calcium moves toropomiasin to expose the active sites for contraction to occur
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Cross bridge cycle aka contraction (4 steps)
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### step 5
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myosin head connects to the newly exposed active site
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(actin and myosin automatically bind)
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### step 6
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stored energy used to pivot to pull
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pulls actin strand/shortens muscle
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(aside)(muscle cramps)
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muscles stuck in position without energy to release the myosin
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### step 7
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releses myosin from the active site
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### step 8
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atp broken down to reset
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relaxation
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### step 9
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neural signal ends
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