DAANCE Basic Sciences and Anatomy 2

Question 1

The glossopharyngeal nerve (CN IX) provides sensory innervation to the:

Accepted Answer

Posterior one-third of the tongue and pharynx

Answer

CN IX carries general and special sensory (taste) fibers from the posterior one-third of the tongue and general sensory fibers from the pharynx.

Question 2

In the cardiovascular system, the sinoatrial (SA) node functions as:

Accepted Answer

The primary pacemaker of the heart

Answer

The SA node spontaneously depolarizes at 60 to 100 bpm under normal conditions, initiating each heartbeat and serving as the heart primary pacemaker.

Question 3

Which respiratory muscle is the primary driver of normal quiet (tidal) breathing?

Accepted Answer

Diaphragm

Answer

The diaphragm accounts for approximately 70 to 80 percent of tidal volume generation during normal quiet breathing.

Question 4

The functional residual capacity (FRC) is important in anesthesia because it:

Accepted Answer

Is the oxygen reserve that delays desaturation during apnea

Answer

FRC is the lung volume at end-expiration and represents the oxygen reservoir available during apnea; lower FRC leads to faster desaturation.

Question 5

During a Valsalva maneuver, intrathoracic pressure increases, which initially causes:

Accepted Answer

A decrease in venous return leading to decreased cardiac output

Answer

Elevated intrathoracic pressure compresses the great veins, impeding venous return and reducing preload, transiently decreasing cardiac output.

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test