Nervous System Part One

Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid:

• potassium

• calcium

• sodium

• chloride

The sympathetic and parasympathetic nervous systems are subdivisions of the:

• autonomic NS

• voluntary NS

• somatic NS

• central NS

• peripheral NS

Which one of the following best describes the waxy-appearing material called myelin:

• a mass of white lipid material that surrounds the dendrites of a neuron

• an outer membrane on a neuroglial cell

• a mass of white lipid material that insulates the axon of a neuron

• a lipid-protein call membrane on the outside of axons

Which of these are not a type of neuroglia found in the CNS?

• Schwann cells

• oligodendrocytes

• ependymal cells

• astrocytes

• microglia

Bipolar neurons are commonly:

• motor neurons

• found in the eye and nose

• more abundant in adults than children

• called neuroglia

An action potential is caused by an influx of these ions into a neuron:

• both potassium and sodium

• potassium

• sodium

• magnesium

The gap between two communicating neurons is termed:

• node of Ranvier

• synaptic cleft

• effector

• cell body

• Schwann cell

A neuron with a cell body located in the CNS whose primary function is connecting other neurons is called:

• efferent neuron

• glial cell

• afferent neuron

• satellite cell

• association neuron

Afferent nerves are called _____, and motor nerves are called ______.

• peripheral nerves: cranial nerves

• sensory nerves: efferent nerves

• motor nerves: sensory nerves

• mixed nerves: motor nerves

The substance that is released at axonal endings to propagate a nervous impulse is called:

• an ion

• an action potential

• sodium-potassium pump

• a neurotransmitter

• nerve glue