The Nurse Is Reviewing the Structures of the Ear

question 35

Multiple Choice

The nurse is reviewing the structures of the ear.Which of these statements concerning the eustachian tube is true?

• A)The eustachian tube is responsible for the production of cerumen.
• B)It remains open except when swallowing or yawning.
• C)The eustachian tube allows passage of air between the middle and outer ear.
• D)It helps equalize air pressure on both sides of the tympanic membrane.

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Definitions:

Central Nervous System

Comprises the brain and spinal cord, responsible for coordinating body activities.

Schwann Cells

Specialized cells that form the myelin sheath around nerve fibers in the peripheral nervous system, aiding in the rapid transmission of electrical signals.

Oligodendrocytes

A type of glial cell in the central nervous system that produces the myelin sheath, helping to increase the speed at which electrical impulses propagate along nerve cells.

Myelin Sheath

A fatty layer that encases and insulates the axons of many neurons, allowing for faster transmission of electrical signals along the nerve cells.