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