The Nurse Understands That in a Third-Degree AV Block

question 13

Multiple Choice

The nurse understands that in a third-degree AV block

• A) every P wave is conducted to the ventricles.
• B) some P waves are conducted to the ventricles.
• C) none of the P waves are conducted to the ventricles.
• D) the PR interval is prolonged.

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Definitions:

Bony Labyrinth

An elaborate network of pathways and spaces located in the temporal bone of the skull, containing the inner ear's hearing and balance mechanisms.

Ossicles

Small bones, particularly referring to the three bones found in the middle ear known as the malleus, incus, and stapes, crucial for hearing.

Membranous Labyrinth

An intricate structure within the inner ear containing fluid-filled tubes and sacs, essential for hearing and balance.

Bony Labyrinth

A complex system of passages and cavities within the temporal bone of the skull, housing the organs of hearing and balance.