Activation of muscle contraction could be a speedy event that's initiated by electrical activity within the surface membrane and transversal (T) tubules. This can be followed by unharness of metal<span> from the inner membrane system, the sarcoplasmic reticulum.
</span>Nervous stimulation causes a depolarization<span> of the muscle membrane (sarcolemma) </span>that<span> triggers </span>the discharge<span> of </span>calcium<span> ions from the sarcoplasmic reticulum.</span>
Aerobic respiration occurs in three stages: glycolysis<span>, the </span>Krebs<span>cycle, and </span>electron transport<span>. In </span>glycolysis<span>, glucose is </span>split<span> into two molecules of pyruvate. This </span>results<span> in a net gain of two ATP molecules.</span>
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Answer:
D. Separate ecosystems can affect each other.
