Movement of Na+ ions into a nerve cell during the upstroke of an action potential is an example of of the following transport mechanismSelect one:a. Simple diffusionb. Primary active transportc. Co-transportd. Facilitated diffusione. Counter-transportClear my choice
Question
Movement of Na+ ions into a nerve cell during the upstroke of an action potential is an example of of the following transport mechanismSelect one:a. Simple diffusionb. Primary active transportc. Co-transportd. Facilitated diffusione. Counter-transportClear my choice
Solution
The movement of Na+ ions into a nerve cell during the upstroke of an action potential is an example of "a. Simple diffusion".
Here's why:
An action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern.
During the upstroke of an action potential, voltage-gated sodium channels open, allowing Na+ ions to flow into the cell. This influx of Na+ ions is down their electrochemical gradient, meaning they move from an area of high concentration to an area of low concentration.
This process does not require energy (ATP), and is therefore a passive process. The specific type of passive transport that best describes this process is simple diffusion.
So, the correct answer is "a. Simple diffusion".
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