Which of the following is true concerning the role of Calcium in the contraction ofmuscle-cells?A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate theburst of Calcium from the sarcoplasmic reticulum.B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate theburst of Calcium from the sarcoplasmic reticulum.C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate theburst of Calcium from intracellular stored-Calcium-organelles.D. No type of muscle cell requires an extracellular inward-Calcium current for normalcontractile-function

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