Learsyguerra26
22.01.2021 •
Biology
Put in order
Acetylcholine diffuses across synapse and
attaches to ACh receptors on sarcolemma
Myosin heads bind to actin forming crossbridges
Nerve impulse reaches the axon terminal
Calcium ions are released from sarcoplasmic reticulum
Calcium ions bind to
regulatory proteins on actin, exposing binding sites for myosin
Actin filaments are pulled toward the center of the sarcomere
ACh causes change in membrane permeability to Na+ and K+; action potential is generated
Acetylcholine is released
The sarcomere shortens and the muscle contracts
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Ответ:
it’s 252 pie units 2
Step-by-step explanation: