A nurse is assessing a client’s cranial nerves. What cranial nerve would be assessed when checking a client’s gag reflex?

CN IX

CN V

CN X

CN XII

Answer and Explanation

The Correct Answer is A

Choice A reason: The glossopharyngeal nerve (CN IX) is primarily responsible for the gag reflex. It provides sensory input from the pharynx and posterior third of the tongue, which triggers the gag reflex when stimulated. This nerve plays a crucial role in swallowing and the reflexive action to prevent choking.

Choice B reason: The trigeminal nerve (CN V) is responsible for facial sensation and motor functions such as biting and chewing. It does not play a direct role in the gag reflex. While it is important for other sensory and motor functions, it is not involved in the reflex being assessed here.

Choice C reason: The vagus nerve (CN X) also contributes to the gag reflex by providing motor innervation to the muscles of the pharynx and larynx. However, the primary sensory input for the gag reflex comes from the glossopharyngeal nerve (CN IX). The vagus nerve works in conjunction with CN IX to complete the reflex action.

Choice D reason: The hypoglossal nerve (CN XII) controls the movements of the tongue. It is essential for speech and swallowing but does not have a role in the gag reflex. The hypoglossal nerve’s primary function is motor control of the tongue muscles.

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Correct Answer is B

Explanation

Choice A reason: Metabolic acidosis is characterized by a decrease in blood pH due to an accumulation of acids or a loss of bicarbonate. It can result from conditions such as diabetic ketoacidosis, renal failure, or severe diarrhea. However, it is not typically associated with opioid overdose. Opioid overdose primarily affects the respiratory system, leading to hypoventilation and respiratory acidosis.

Choice B reason: Respiratory acidosis occurs when there is an accumulation of carbon dioxide (CO2) in the blood due to hypoventilation. Opioid overdose depresses the central nervous system, leading to decreased respiratory rate and depth, which causes CO2 retention. This results in a decrease in blood pH, leading to respiratory acidosis. Symptoms may include confusion, lethargy, and shortness of breath.

Choice C reason: Respiratory alkalosis is characterized by a decrease in blood CO2 levels due to hyperventilation. It can occur in conditions such as anxiety, fever, or high altitude. Opioid overdose, however, causes hypoventilation rather than hyperventilation, making respiratory alkalosis an unlikely outcome.

Choice D reason: Metabolic alkalosis is characterized by an increase in blood pH due to an accumulation of bicarbonate or a loss of acids. It can result from conditions such as prolonged vomiting, diuretic use, or excessive bicarbonate intake. Opioid overdose does not typically lead to metabolic alkalosis. The primary concern with opioid overdose is respiratory depression and the resulting respiratory acidosis.

A. Ask the client to clench their teeth and assess facial sensation. B. Ask the client to identify scented aromas. C. Ask the client to read a Snellen chart. D. Ask the client to raise his eyebrows.

Correct Answer is A

Explanation

Choice A Reason:

Cranial nerve V is the trigeminal nerve, which has both motor and sensory functions:Motor function: The nurse can assess this by asking the client to clench their teeth while palpating the masseter and temporalis muscles for strength.Sensory function: The nurse can assess this by lightly touching the client's face in different areas (forehead, cheeks, and jaw) with a cotton ball or sharp/dull object to check for sensation.

Choice B Reason:

Asking the client to identify scented aromas is a method used to assess cranial nerve I (Olfactory), not cranial nerve V. Cranial nerve V (Trigeminal) is assessed by testing facial sensation and motor functions such as chewing.

Choice C Reason:

Asking the client to read a Snellen chart is a method used to assess cranial nerve II (Optic), which is responsible for vision. This method does not assess cranial nerve V

Choice D Reason:

Asking the client to raise his eyebrows is a method used to assess cranial nerve VII (Facial), which controls facial expressions. This method is not used to assess cranial nerve V.

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A nurse is assessing a client’s cranial nerves. What cranial nerve would be assessed when checking a client’s gag reflex?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is B

Explanation

A nurse is assessing a client’s cranial nerves. Which methods should the nurse use to assess cranial nerve V?

Correct Answer is A

Explanation

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