What causes ion selectivity in channels?Group of answer choicesThe electrical resistance of the neuron.The specific pore size and charged residues along the pore.The amount of myelin around the axon.The length of the axon hillock
Question
What causes ion selectivity in channels?Group of answer choicesThe electrical resistance of the neuron.The specific pore size and charged residues along the pore.The amount of myelin around the axon.The length of the axon hillock
Solution
The ion selectivity in channels is caused by the specific pore size and charged residues along the pore. This is because different ions have different sizes and charges, and the specific arrangement and charge of the residues in the pore determine which ions can pass through. The pore forms a selective filter that allows only certain types of ions to pass through, while blocking others. This is crucial for the proper functioning of neurons, as it allows them to generate and propagate electrical signals. The other options - the electrical resistance of the neuron, the amount of myelin around the axon, and the length of the axon hillock - do not directly influence ion selectivity in channels.
Similar Questions
Which structural features of K+ channels account for: a) ion selectivity, b) voltage sensitivity, and c) ion conductance?
Which of the following is false regarding Na+ ion channels in a neuron?Group of answer choicesTheir concentrations are highest at the nodes of Ranvier.Na+ can move from an area of high concentration inside a cell to an area of low concentration outside the cell through these channels.They permit the movement of Na+ ions in only one direction.The Na+ ion channels are integral membrane proteins.
Which ions are involved in the diffusion across ion channels during the transmission of an electrical impulse in a neuron?*2 pointsCl and CaNa and KMg and PFe and Zn
The cell membrane of a neuron has both gated and non-gated ion channels. Which type of non-gated channel is more abundant?Multiple ChoiceNon-gated sodium channelsNon-gated potassium channels
Synaptic potentials are due to the opening of what type of channels?Multiple ChoiceVoltage-gated ion channelsChemically-gated ion channels
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.