Ch. 18 - Mouth, throat, nose, sinuses

Which cranial nerve is responsible for the sense of smell?

• Cranial nerve V (trigeminal)

• Cranial nerve VII (facial)

• Cranial nerve IX (glossopharyngeal)

• Cranial nerve I (olfactory)

Answer explanation

Cranial nerve I, known as the olfactory nerve, is specifically responsible for the sense of smell. The other options listed do not have this function.

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DOK Level 2: Skill/Concept

What is the primary function of the paranasal sinuses?

• Aid in digestion

• Decrease the weight of the skull and act as resonance chambers during speech

• Assist in the sense of taste

• Filter and moisten air

Answer explanation

The primary function of the paranasal sinuses is to decrease the weight of the skull and act as resonance chambers during speech, enhancing vocal quality and reducing skull mass.

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DOK Level 2: Skill/Concept

Identify the cranial nerve that assists in the movement of the tongue.

• Cranial nerve V (trigeminal)

• Cranial nerve VII (facial)

• Cranial nerve IX (glossopharyngeal)

• Cranial nerve XII (hypoglossal)

Answer explanation

Cranial nerve XII (hypoglossal) is responsible for the motor control of the tongue, enabling its movement. The other cranial nerves listed do not primarily control tongue movement.

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DOK Level 2: Skill/Concept

Which of the following is NOT a function of the nose and paranasal sinuses?

• Receiving air

• Filtering air

• Aiding in speech

• Moistening air

Answer explanation

The nose and paranasal sinuses primarily function to receive, filter, and moisten air. While they contribute to resonance, aiding in speech is not a direct function of these structures.

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DOK Level 2: Skill/Concept

How many pairs of paranasal sinuses are there?

• Two

• Three

• Four

• Five

Answer explanation

There are four pairs of paranasal sinuses: maxillary, frontal, ethmoid, and sphenoid. Each pair is located in different areas of the skull, contributing to functions like resonance and reducing skull weight.

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DOK Level 2: Skill/Concept

Which of the following is a function of the mouth and throat in the digestive system?

• Filtering air

• Decreasing the weight of the skull

• Preparing food for digestion

• Acting as resonance chambers

Answer explanation

The mouth and throat play a crucial role in preparing food for digestion by mechanically breaking it down through chewing and mixing it with saliva, which begins the digestive process.

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DOK Level 2: Skill/Concept

Which of the following is NOT a pair of paranasal sinuses?

• Frontal

• Maxillary

• Ethmoidal

• Temporal

Answer explanation

The temporal sinus is not a recognized paranasal sinus. The frontal, maxillary, and ethmoidal sinuses are all part of the paranasal sinus system, which helps with air flow and drainage in the nasal cavity.

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DOK Level 2: Skill/Concept

What is the function of the cranial nerve IX (glossopharyngeal) in the mouth and throat?

• Smell

• Taste and swallowing

• Facial expressions

• Tongue movement

Answer explanation

Cranial nerve IX, or the glossopharyngeal nerve, is responsible for taste sensation from the posterior one-third of the tongue and plays a key role in the swallowing process, making 'Taste and swallowing' the correct answer.

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DOK Level 2: Skill/Concept