Review 3.2 - 3.3: Neurons and Nerve Impulses

Neurons are used in the human body to transmit "messages" to ____.

• Other neurons

• Other cells in the body

• Neurons and other cells in the body

The main "cell" part of a neuron is/are called the _____.

• Axon

• Cell body

• Dendrites

• Axon terminals

The _____ of a neuron branch off the cell body and receive nerve impulses from other neurons to funnel toward the cell body.

• Dendrites

• Axon terminals

• Axon

• Nodes of Ranvier

The _____ of a neuron is like a long "neck" that carries nerve impulses away from the cell body.

• Dendrites

• Axon terminals

• Axon

• Nodes of Ranvier

The _____ is / are small bulb-like structures at the end of an axon.

• Dendrites

• Axon terminals

• Axon

• Nodes of Ranvier

The _____ is / are a protective, fatty layer that surrounds the axon of a neuron.

• dendrites

• myelin sheath

• gray matter

• nodes of Ranvier

What is the purpose of the myelin sheath on an axon?

• Protects the axon from ripping off the cell body of the neuron

• Surrounds the axon to keep the cytoplasm and water inside the neuron

• Insulates the axon to make a nerve impulse travel faster down the axon

The sections of uninsulated axon on a neuron are called _____.

• nodes of Ranvier

• nodes of Myelin

• gaps of Ranvier

• gaps of Myelin

____ is deeper in the brain and is composed of a lot of neurons with myelinated axons.

• Gray matter

• White matter

• Pink matter

The area where the axon terminals of one neuron come in close proximity to the dendrites of another neuron is called the ____.

• Neuronic divide

• Synaptic cleft

• Axonic canyon