How muscles contract Flashcards
1
Q
sliding filament theory
A
the theory that the actin and myosin filaments overlap during muscle contraction
2
Q
tropomyosin
A
a long chain protein molecule that wraps around the double actin chains and covers the myosin binding sites in the relaxed state
3
Q
troponin
A
protein molecules attached to tropomyosin; they change shape when attached to calcium ions, pulling on the tropomyosin and revealing the myosin binding sites on the actin strands
4
Q
actomyosin
A
the chemical produced when cross-bridges form between actin and myosin during muscle contraction
