If the plasma membrane of an electrically excitable cellwere depolarized to threshold in the center of the axon orsarcolemma, would the action potential be propagated inonly one direction? Why or why not?

Describe what allows an action potential to move quickly along the membrane in one direction (why doesn't it move backwards?)

Describe leak ion channels and gated ion channels. Howare they responsible for the permeability of a restingversus a stimulated plasma membrane?

apucreceptors ava ble at the synapse are reflected in this number. Question 2: In this chapter, we discussed a GABA-gated ion channel that is permeable to Cl. GABA also activates a G-protein-coupled receptor called the GABA receptor, which causes potassium-selective B channels to open. What effect would GABAB receptor activation have on the membrane potential? GABAB receptor activation causes potassium-selective channels to open. As a result this bringhs the

Action potentials propagate in one direction because of: O K+ Voltage-gated Channels become inactive for a while O Nat Voltage-gated Channels become inactive for a while O K+ nongated Channels become inactive for a while O Nat nongated Channels become inactive for a while

Imagine a neuron that has a thousand axonal terminals synapsing on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not fire an action potential. What could be a possible explanation as to why this could be?

A post-synaptic cell receives a signal that causes it to hyperpolarize. Which statement is NOT true about this dynamic? O The cell is now more negative than it was before. This describes an EPSP It will be harder for the cell to reach threshold and generate a new action potential. O This could have been achieved through either spatial or temporal summation.

The membrane voltage in graded potentials can be produced by Oopen channels and ligand-gated chanels Ovoltage-gated channels Oligand-gated and mechanically gated channels Oligand-gated channels mechanically gated channels

These cells fire graded potentials or graded potentials or both?

Some postsynaptic synapses are called silent synapses due to the lack of AMPA receptors. Why do those synapses not have a synaptic response at the resting membrane potential? Explain under what conditions you would still be able to detect a postsynaptic response from those silent synapses.