AP 1 (11-8)

What are the two postsynaptic potentials?
- Excitatory postsynaptic potential
- Inhibitory postsynaptic potential
Describe the effect that an excitatory postsynaptic potential would have on a neuron.
- Graded depolarization is caused by the neurotransmitter arrival.
- Shifts transmembrane potential closer to threshold
Describe the effect that an inhibitory postsynaptic potential would have on a neuron.
- Graded hyperpolarization is caused by the neurotransmitter arrival.
- More inhibition, larger-than-usual stimulus needed to reach threshold.
What determines if a nerve impulse will be conducted?

The net effect at the axon hillock.
The threshold is lowest at what part of the cell body?

Axon hillock
What are the two types of summation?
- Temporal summation
- Spatial summation
Describe temporal summation.

A single synapse stimulated repeatedly.
Describe temporal summation.

Involves multiple synapses activated simultaneously.
In spatial summation, the degree of depolarization dependent on what two factors?
- Number of synapses are active at a particular moment.
- Distance from initial segment.

Author

mc166589

119589

Card Set

AP 1 (11-8)

Description

AP 1 chapter 11.

Updated

2011-11-29T18:25:29Z