Nervous System

Part of the nervous system made of the brain and spinal cord.

• central nervous system
• peripheral nervous system

What is the insulating membrane that surrounds parts of the axon that helps the impulses travel faster called?

• Axon
• Dendrites
• Node of Ranvier
• Myelin Sheath

What is the chemical used by a neuron to transmit an impulse across a synapse to another nerve cell?

• Neurotransmitters
• Synapse
• Threshold
• Impulse

The afferent neuron:

• monitor changes both inside and outside body and sends signal to control center.
• gathers information and decides what to be done.
• activates effector organs

Muscle contraction is an example of:

• autonomic
• somatic

When a neuron is depolarized, what are the first channels to open?

• Sodium
• Potassium
• Calcium
• ACTH

When a neuron is resting, the inside of the axon has a ____________ charge.

• positive
• negative

When a neuron is not engaged in an impulse.

• Resting potential
• Action potential
• Neural potential
• Synaptic potential

The junction between two communication neurons is called the

• Synapse
• Neurotransmitter
• Nerve Pathway
• Calcium Channel

At resting potential, the neuron is

• polarized
• depolarized
• repolarized