If your sleeping child eyes is moving back and forth while his eyelids are closed it is likely that he is sleep
Answer:
D
Explanation:
Carbo (Carbon) Hydr (hydrogen) Ates (Oxygen)
Excitation-contraction coupling refers to the series of events that begins with the excitation of the sarcolemma in response to stimulation by a neurotransmitter, and results in the release of calcium ions from the sarcoplasmic reticulum.
Hence, option D is the 1st process that starts the excitation-contraction coupling.
Since enzymes function as organic catalysts, a cell would not be able achieve homeostasis if the required enzymes were not present.