Which statement best compares the source of Ca2+ used for...

Which statement best compares the source of Ca2+ used for contraction in skeletal vs cardiac muscle?

hard

ABoth rely only on extracellular Ca2+ entering from blood

Skeletal muscle relies mainly on Ca2+ release from the SR; cardiac muscle uses extracellular Ca2+ entry to help trigger SR release

CSkeletal muscle cannot store Ca2+ in the SR

DCardiac muscle has no SR at all

ENeither muscle type uses Ca2+ for contraction

Explanation

Skeletal muscle contraction is driven mainly by SR Ca2+ release. Cardiac muscle requires Ca2+ entry from outside the cell to trigger further SR release (Ca-induced Ca release).

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Source: entermedschool.org

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