The rapid upstroke of a SA nodal cell action potential is due to the opening of voltage-gated Na+ channels.
The rapid upstroke of a SA nodal cell action potential is due to the opening of voltage-gated Na+ channels.
answer should clearly state whether or not the statement is correct and then concisely explain why. the answer should be 3-5 sentences and address all of the points in the statement.
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Both transmembrane carrier proteins and transmembrane channel proteins can mediate active transport of a hydrophilic solute through a cell plasma membrane.
This statement is incorrect. Movement of a solute through a channel protein is always passive, whereas carrier-mediated transmembrane transport can be either passive or active. A transmembrane channel protein creates a pore through the membrane allowing for simple diffusion of a hydrophilic solute down a concentration gradient through the membrane. In contrast, transmembrane carrier protein interacts with and ‘escorts’ a hydrophilic solute through the membrane and is capable of transporting a solute against a concentration gradient.
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