An action potential reaches the synaptic terminal. ACh is released into the synaptic cleft and it binds to ACh receptors, making the muscle cell's membrane permeable for Na+. Depolarization occurs when the ions go into the sarcoplasm and is spread to the center of the cell via T-Tubules.
You're getting it!
Depolarisation in the sarcoplasmic reticulum makes calcium ions get released. These Ca2+ ions go into the sarcoplasm and will bind to Troponin. It will change tropomyosins position on Actin and therefor make it possible for Myosin the bind to the myosin binding sites.
Now explain what depolarization does :)!
The sliding filament model!!!!!!!!!!!!!!!!
Lastly, the "myosin heads" will have an interation with actin. This is what causes the contraction of muscles
Perfect! And what is the model that can demonstrate how the contraction of the muscle cell happens?
Myosin and Actin met at the Library after school. They studied for a few hours and eventually Myosin gave Actin an explanation of muscle contractions verbally in order to test her knowledge.
Myosin continues on with her description on muscle contractions making Actin a very proud friend!
Myosin finishes her explanation and they both decide they are ready for the exam. (Both Myosin and Actin both get 100s and are very excited!)