Nervous System Overview and Transmission of Impulses

The two divisions of the nervous system are the _____ nervous system and the peripheral nervous system.

• automatic

• controlled

• sensory

• central

Nerves that transmit impulses from the CNS out to the muscles and glands are called _____.

• afferent

• sensory

• efferent

• inferrent

Neuroglia, specialized cells that perform support functions, are also known as _____.

• dendrites

• glial cells

• neurilemma

• myelin sheaths

Which of the following is not a type of glial cell?

• astrocytes

• Schwann cells

• oligodendrocytes

• sympathetic cells

Axon fibers are insulated by a _____, which increase the rate of neural impulse transmission.

• myelin sheath

• dendrite

• neuroglia

• cell body

Which of the following terms means the charge inside a membrane is more positive?

• depolarized

• conducted

• polarized

• irritated

The electrical charge in a neuron is known as a nerve impulse, or _____.

• all-or-none potential

• refractory period

• saltatory conduction

• action potential

_____ conduction results in significantly faster impulse transmission.

• Polarized

• Refractory

• Saltatory

• Depolarized

Communication between neurons occurs at the _____.

• synapse

• dendrites

• action potential

• impulse

_____ are simple, rapid, involuntary, programmed responses to stimuli.

• Transmissions

• Reflexes

• Impulses

• Conductions