What is the role of active transport in the transmission of nerve impulses by neurones?
A. Propagates an action potential by pumping sodium ions across the membrane out of the neurone. B. Propagates an action potential by pumping sodium ions across the membrane into the neurone. C. Initiates the action potential needed for the transmission of an impulse by pumping calcium ions out of the endoplasmic reticulum. D. Establishes the resting potential needed for the transmission of an impulse by pumping sodium and potassium ions across the membrane.
D. Neurons have a membrane made of plasma, which allows substances to enter and exit. Active transport means that this flow in and out requires energy to function. Adenosine triphosphate is used as this energy source and is formed within the cells.
Sodium and potassium are pumped in and out of the neuron but in unequal measures by design, as this creates a positive charge, or impulse. D is the correct choice as it explains that active transport, with the necessary energy, helps to transmit the nerve impulses. Sodium and potassium are both required.