DAANCE Basic Sciences and Anatomy 5

Question 1

The circle of Willis is formed by which set of arteries?

Accepted Answer

Internal carotid, anterior cerebral, posterior cerebral, anterior and posterior communicating arteries

Answer

The circle of Willis is an anastomotic ring formed by the internal carotid arteries, anterior and posterior cerebral arteries, and the anterior and posterior communicating arteries.

Question 2

Which phase of the cardiac cycle corresponds to ventricular filling?

Accepted Answer

Diastole

Answer

Diastole is the phase when ventricular muscle relaxes and the ventricles fill with blood from the atria.

Question 3

In the context of dental sedation, which muscle is the primary muscle of mastication responsible for elevating the mandible?

Accepted Answer

Masseter

Answer

The masseter is the primary elevator of the mandible and one of the most powerful muscles of mastication.

Question 4

Which electrolyte imbalance is most likely to cause cardiac arrhythmias during anesthesia?

Accepted Answer

Hypokalemia

Answer

Hypokalemia (low serum potassium) destabilizes myocardial cell membranes and can precipitate life-threatening arrhythmias including ventricular fibrillation.

Question 5

The trachea bifurcates into the right and left main bronchi at the level of which anatomical landmark?

Accepted Answer

Angle of Louis (sternal angle) at T4-T5

Answer

The trachea bifurcates at the carina, located at the level of the sternal angle (angle of Louis), which corresponds to the T4-T5 vertebral level.

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test

DAANCE Basic Sciences and Anatomy 5