And next up, we have our friendly biologist, Mrs. Cool here to explain the Sliding Filament Hypothesis!
Well first, we must know that nerve impulses from motor neurons is what controls muscle contractions. Now I can begin. When Acetylcholine, a magic chemical, is released into the synaptic cleft, it binds to receptors to stimulate an action potential.
from the beginning, duh!
oooomaagoodness! I am just sooo excited to teach alll the children about the Sliding Filament Hypothesis! Where shall I begin?
Then the action potential goes from the sarcolemma to all the myofibrils and through the T-Tubules. Calcium ions are released by the sarcoplasmic reticulum and binds to tropomyosin to expose myosin binding sites.