EPSPs, IPSPs and Summation

What happens when a neurotransmitter binds to its receptor on a receiving cell?

• It causes the cell to divide.

• It causes ion channels to open or close.

• It causes the cell to change shape.

• It causes the cell to release more neurotransmitters.

What is the effect of an excitatory postsynaptic potential (EPSP) on the membrane potential?

• It hyperpolarises the membrane.

• It depolarises the membrane.

• It has no effect on the membrane potential.

• It makes the membrane potential more negative.

What is the primary effect of an inhibitory postsynaptic potential (IPSP)?

• It makes the target cell more likely to fire an action potential.

• It makes the target cell less likely to fire an action potential.

• It causes the target cell to release neurotransmitters.

• It causes the target cell to divide.

How does an EPSP affect the inside of the cell?

• It makes the inside of the cell more negative.

• It makes the inside of the cell more positive.

• It makes the inside of the cell neutral.

• It has no effect on the inside of the cell.

What is the result when multiple EPSPs sum together?

• They can trigger an action potential.

• They cancel each other out.

• They cause the cell to shrink.

• They have no effect on the cell.

What is the threshold in the context of membrane potential?

• The point at which the cell divides.

• The point at which an action potential is triggered.

• The point at which the cell releases neurotransmitters.

• The point at which the cell becomes inactive.

What is the effect of an IPSP on the membrane potential?

• It depolarises the membrane.

• It hyperpolarises the membrane.

• It makes the membrane potential more positive.

• It has no effect on the membrane potential.

Which of the following is true about EPSPs and IPSPs?

• EPSPs and IPSPs have the same effect on the membrane potential.

• EPSPs make the membrane potential more positive, while IPSPs make it more negative.

• EPSPs make the membrane potential more negative, while IPSPs make it more positive.

• EPSPs and IPSPs both make the membrane potential more positive.

What happens if a single EPSP is not large enough to bring the neuron to threshold?

• It will automatically trigger an action potential.

• It can sum with other EPSPs to trigger an action potential.

• It will cause the neuron to become inactive.

• It will cause the neuron to release neurotransmitters.

What is the role of ion channels in the context of neurotransmitter binding?

• They allow neurotransmitters to enter the cell.

• They open or close to change the membrane potential.

• They release neurotransmitters from the cell.

• They cause the cell to divide.