Arrange these structures as they participate in excitation-contraction.

A. Sarcolemma, sarcoplasmic reticulum, Ca2+, T tubules
B. Ca2+, T tubules, sarcolemma, sarcoplasmic reticulum
C. T tubules, sarcolemma, Ca2+, sarcoplasmic reticulum
D. Sarcolemma, T tubules, sarcoplasmic reticulum, Ca2+
E. Sarcoplasmic reticulum, Ca2+, T tubules, sarcolemma


Answer: D

Anatomy & Physiology

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