5.3 Physiology of the Muscular System Part 4 Flashcards
1
Q
What is needed for the cross-bridges to pull the actin filaments?
A
ATP
2
Q
What produces a muscle contraction?
A
movement of many actin filaments together
3
Q
When does a muscle contraction cease?
A
when the nerve impulses no longer stimulate the muscle fiber
4
Q
When does relaxation of the muscle occur?
A
when calcium ions are returned to the sarcoplasmic reticulum
