Sliding Filament Theory Flashcards
Calcium cause the release of what neurotransmitter into the synapse?
Acetylcholine
What is the first step of the sliding filament theory?
Nerve impulse arrives at the axon & causes calcium ions to be released.
What does acetylcholine bind with & where?
Acetylcholine binds with receptor proteins on the sarcolemma.
What does binding initiate?
A nerve impulse that spreads over the sarcomere and into the sarcoplasmic reticulum.
The sarcoplasmic reticulum releases calcium ions into the sarcoplasm, what does this cause?
The calcium ion release allows for cross bridges on the myosin to link with actin.
What does the movement of the cross bridges result in?
The thin actin sliding over the thicker myosin
The distance between the z lines shorten and therefore the whole sarcomere. If the sarcomeres shorten what does this result in and why?
The entire muscle will contract as each muscle fibre consists of thousands of sarcomeres.
What is required for the movement of actin filaments?
ATP!
