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. Facilitated diffusionb. Co-transportc. Primary active transportd. Simple diffusione. Counter-transport
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. Facilitated diffusionb. Co-transportc. Primary active transportd. Simple diffusione. Counter-transport
Solution 1
The movement of Na+ ions into a nerve cell during the upstroke of an action potential is an example of a. Facilitated 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 Na+ channels open, allowing Na+ ions to flow into the cell. This process is driven by the electrochemical gradient, as the concentration of Na+ ions is higher outside the cell than inside, and the inside of the cell is negatively charged relative to the outside.
This movement of ions down their electrochemical gradient does not require the input of energy, so it is a form of passive transport. However, it is not simple diffusion, because it requires the assistance of a specific protein - in this case, the voltage-gated Na+ channel.
Therefore, this process is best described as facilitated diffusion, which is a type of passive transport that uses transport proteins to move substances down their concentration gradients.
Solution 2
The movement of Na+ ions into a nerve cell during the upstroke of an action potential is an example of a. Facilitated 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 Na+ channels open, allowing Na+ ions to flow into the cell. This process is driven by the electrochemical gradient, as the concentration of Na+ ions is higher outside the cell than inside, and the inside of the cell is negatively charged relative to the outside.
This movement of ions down their electrochemical gradient does not require energy and is facilitated by the opening of the voltage-gated Na+ channels. Therefore, it is an example of facilitated diffusion.
Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins.
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