The answer is in the image attached.
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An electron transport chain (ETC) is a series of complexes that transfer electrons from electrondonors to electron acceptors via redox (both reduction and oxidation occurring simultaneously) reactions, and couples this electron transfer with the transfer of protons (H+ ions) across a membrane.
A resting plasma membrane has carrier proteins on its surface. Energy derived from ATP is usually utilized by these carriers to change their shape in order to carry different molecules into or out of the cell. The sodium pump is a membrane protein which uses energy from ATP to carry sodium ions out of the cell and allow potassium ions into the cell to replace sodium.
