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What are 2 likely reasons a Cl ion cannot pass through a sodium ion channel?

The size of the Cl ion is larger than the pore size of the sodium ion channel, preventing it from passing through. The charge on the Cl ion (-1) is different from that of the sodium ion channel (+1), causing repulsion and prohibiting the Cl ion from passing through.


Binding of a signaling molecule to which type of receptor leads directly to a change in distribution of ions on opposite sides of the membrane?

Ion channel receptors. These receptors allow specific ions to flow through a channel when activated by a signaling molecule, resulting in a change in ion distribution across the membrane and altering the membrane potential.


What is a sodium ion leak channel?

A sodium ion leak channel is a protein channel in the cell membrane that allows sodium ions to leak into or out of the cell. This helps to maintain the resting membrane potential of the cell by balancing the movement of ions across the membrane. Sodium ion leak channels are important for regulating the excitability of neurons and muscle cells.


Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?

Ionotropic receptors are directly gated by the binding of a signaling molecule, leading to a change in ion channel permeability and subsequent redistribution of ions across the membrane. This rapid change in ion flow plays a crucial role in mediating fast synaptic transmission in the nervous system.


What is a protein channel made of?

An ion is an atom of any element, or a molecule of any compound, in which the number of positive charges (protons) and the number of negative charges (electrons) are not equal. Hence the ion is an atom or molecule with a net charge.