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The most superior portion of the pharynx is the:

A.

Septum

B.

Oropharynx

C.

Nasopharynx

D.

Laryngeal pharynx

Answer and Explanation

The Correct Answer is C

A. The septum refers to the nasal septum, which divides the nasal cavity into two nostrils. It is not part of the pharynx.
B. The oropharynx is located below the nasopharynx and serves as a passage for both air and food. It is not the most superior portion of the pharynx.
C. The nasopharynx is the most superior portion of the pharynx, located behind the nasal cavity and above the soft palate. It is primarily involved in the passage of air from the nasal cavity to the rest of the respiratory system.
D. The laryngeal pharynx (or hypopharynx) is the portion of the pharynx below the oropharynx, just above the larynx, and it
 


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Related Questions

Correct Answer is C

Explanation

A. The internal exchange of gases occurs at the tissue level, where oxygen is delivered to cells and carbon dioxide is removed. The diaphragm is not involved in this process.
B. Exhalation involves the relaxation of the diaphragm, which causes the lungs to compress and air to be expelled from the lungs.
C. During inhalation, the diaphragm contracts and moves downward, creating more space in the chest cavity, which allows the lungs to expand and air to flow in.
D. The external exchange of gases occurs in the lungs, where oxygen is transferred into the blood and carbon dioxide is removed, but it is not directly linked to diaphragm contraction.

Correct Answer is A

Explanation

A. Hypercapnia refers to elevated levels of carbon dioxide (CO₂) in the blood, which can occur due to respiratory problems or insufficient ventilation.
B. Hypoxemia is a condition where there is low oxygen in the blood, not related to carbon dioxide levels.
C. Hypocapnia refers to low levels of carbon dioxide in the blood, often caused by hyperventilation.
D. Hypoxia refers to low oxygen levels in the tissues, not the blood levels of carbon dioxide.

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