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.
The benefits were more species and also more resources.<span />
Answer: False. HIV cannot reproduce on its own.
The tap root system is one type of root system in which a primary root known as the radicle branches into smaller roots known as the secondary roots. The answer to this problem hence is C. <span>.there is a prominent primary root from which secondary roots branch out</span>
