The __________ provides most of the Ca²⁺ needed for myocardial contraction. A) extracellular fluid B) mitochondria C) sarcoplasmic reticulum D) Golgi apparatus E) cytoskeleton

Question

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The sarcoplasmic reticulum is a specialized type of smooth endoplasmic reticulum that surrounds each myofibril in a muscle fiber. It is responsible for regulating intracellular calcium ion levels, and thus providing most of the Ca2+ needed for myocardial contraction.

The __________ Provides Most of the Ca2+ Needed for Myocardial

The __________ Provides Most of the Ca²⁺ Needed for Myocardial