What is the role of calcium ions in muscle contraction? a) Calcium ions are responsible for the release of acetylcholine. b) Calcium ions are resp...
What is the role of calcium ions in muscle contraction?
a) Calcium ions are responsible for the release of acetylcholine.
b) Calcium ions are responsible for the opening of sodium channels.
c) Calcium ions are responsible for the opening of calcium channels.
d) Calcium ions are responsible for the separation of myosin from actin.
e) Calcium ions are responsible for the formation of cross-bridges between myosin and actin.
a) Calcium ions are responsible for the release of acetylcholine.
b) Calcium ions are responsible for the opening of sodium channels.
c) Calcium ions are responsible for the opening of calcium channels.
d) Calcium ions are responsible for the separation of myosin from actin.
e) Calcium ions are responsible for the formation of cross-bridges between myosin and actin.
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Ed 
O papel dos íons de cálcio na contração muscular é a alternativa c) os íons de cálcio são responsáveis pela abertura dos canais de cálcio. Quando um potencial de ação chega ao terminal nervoso, a acetilcolina é liberada e se liga aos receptores na membrana da fibra muscular, o que causa a abertura dos canais de cálcio. A entrada de cálcio na célula muscular desencadeia uma série de eventos que levam à contração muscular.
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