A synapse is a specialized junction between cells. It is involved in the integration and converging of signals between neurons. At a synaptic junction, the membranes of the pre- and post- synaptic neurons are separated by a gap called a synaptic cleft, which is the site of neurotransmitter release. 

Glutamate opens sodium channels in the plasma membrane of the receiving neuron, moving the action potential towards (depolarize) the sodium Nernst potential (81mV). GABA is an inhibitory neurotransmitter which opens chloride channels in the plasma membrane of the receiving neuron, making the neuron more difficult to excite (hyperpolarized). 

The resting membrane potential is based on the difference in electrical charges of the ions that flow through the membrane. The membrane potential has a greater permeability to potassium when at rest which causes a shift in its potential. Thus, potassium has the strongest affect on the RMP and causes it to be closer to potassium's reversal potential. Side note: This potential is strongly held by the sodium potassium pump.

If an already positive membrane potential becomes more positive, it is becoming hyperpolarized because the electrical difference between the inside and outside of the cell is getting larger. On the other hand, a stimulus that moves the potential difference closer to 0 is depolarizing because it is decreasing the difference in electrical potential between the inside and outside of the cell.

Myelin helps to increase resistance along the axon, which helps to propagate the action potential along the axon.

In order to have an action potential, you must have a depolarization. Na channels must close before K channels open

The action potential of a neuron is generate at the axon hillock and is propagated down the axon and to the terminal branches where it will synapse with the dendrites of the next neuron.

The influx of positive sodium ions into the neuron is known as depolarization. This is the loss of negative charge that occurs when positive sodium passes through the neural membrane and enters the neuron.

Depolarization is when the neuron becomes more positive by gaining positively charged ions, specifically sodium ions. During depolarization the sodium ion channels open and sodium ions enter the neuron, reducing the membrane potential to roughly +35 mV.

There are three possible neural cell structures: unipolar, bipolar, and multipolar. Bipolar neurons have only two extensions coming off of the cell body, typically the dendrite extension and the axon extension. Although there are only two extensions coming off of the neuron, it is still capable of interacting with many other neurons due to subsequent branching beyond the junction with the cell body.