DAANCE Anatomy and Physiology 2

Question 1

The trigeminal nerve (CN V) is the primary sensory nerve of the face. Which division provides sensory innervation to the maxillary teeth?

Accepted Answer

Maxillary division (V2)

Answer

The maxillary division (V2) innervates the maxillary teeth, upper lip, cheek, and part of the nasal cavity via the superior alveolar nerves.

Question 2

The Frank-Starling mechanism describes the relationship between:

Accepted Answer

Ventricular end-diastolic volume and stroke volume (the more the ventricle fills, the more it contracts)

Answer

The Frank-Starling law states that increasing preload (ventricular filling) stretches myocardial fibers, increasing contractility and stroke volume - within physiologic limits.

Question 3

The hypoglossal nerve (CN XII) controls which function relevant to airway management?

Accepted Answer

Motor innervation of the intrinsic and extrinsic tongue muscles

Answer

CN XII provides motor innervation to all intrinsic and most extrinsic tongue muscles (except palatoglossus), controlling tongue movement and position.

Question 4

The carotid body is a peripheral chemoreceptor that responds primarily to:

Accepted Answer

Decreasing arterial O2 (PaO2 falling below 60 mmHg) and rising H+ (acidosis)

Answer

Carotid body chemoreceptors are stimulated primarily by hypoxemia (PaO2 below 60 mmHg), hypercapnia, and acidosis, triggering increased ventilatory drive.

Question 5

The alveolar-arterial oxygen gradient (A-a gradient) is useful in assessing:

Accepted Answer

Whether hypoxemia results from hypoventilation alone or includes a pulmonary gas exchange problem

Answer

A normal A-a gradient suggests hypoxemia from hypoventilation; an elevated gradient suggests ventilation-perfusion mismatch or diffusion impairment from pulmonary disease.

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test

DAANCE Anatomy and Physiology 2