Neural Communication

Review: What are the main parts of the neuron?

a

b

c

d

Cell Body

Nucleus

Dendrites

Axon

Review: When a message is sent at only one uniform strength and speed, it is known as:

• continuous wave
• analog signal
• All-or-none phenomenon

• Full message phenomenon

The nerve impulse or 'buzz' is called:

• action potential
• synaptic transmission
• nerve signal
• electrical charge

What is the first phase of neural communication called?

• Resting Potential

• Refractory Period

• Action Potential

During the first phase, the neuron is more _____ charged on the outside and more _____ charged on the inside.

• negatively, positively

• negatively, negatively

• positively, positively

• positively, negatively

Why is the neuron more positively charged on the outside in comparison to the inside?

When a neuron has a negatively charged membrane potential, or in this case when the neuron is positively charged on the outside and negatively charged on the inside, it is said to be:

• Hyperpolarized

• Repolarized

• Polarized

The stimulus (like a spider brushing against your leg) and the resulting change must be strong enough to send the message. Therefore it must cross a:

• barrier
• limit
• threshold value
• threshold

When a stimulus crosses the threshold, positive ions enter the neuron making it:

• Polarized

• Depolarized

• Hyperpolarized

• Repolarized

When the stimulus is great enough and the message is being sent through the neuron, this is the second phase of neural communication known as:

• Resting Potential

• Refractory Period

• Action Potential