What is used in facilitated diffusion to assist the transport of sugar and sodium molecules?

Answer 1

channels are proteins that are enmeshed in the cell membrane.

These are usually gated by some mechanism; for example, in neurons, sodium channels are typically closed to prevent the presence of a specific voltage gradient.

Alternatively, NMDAR require a specific voltage in addition to a ligand (such as glutamate, D-serine, etc.) attaching to its receptor.

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Answer 2

Sebastian Alvarado

Carrier proteins are used in facilitated diffusion to assist the transport of sugar and sodium molecules across the cell membrane.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.