Which of the following is a structure that protects the airway during the process of swallowing?
Trachea
Epiglottis
Uvula
Pharynx
The Correct Answer is B
A. The trachea is the windpipe that carries air to the lungs. While it plays a role in respiration, it does not protect the airway during swallowing.
B. The epiglottis is a flap of cartilage that covers the trachea during swallowing, preventing food or liquid from entering the airway and directing it to the esophagus.
C. The uvula is part of the soft palate that helps in the swallowing process but does not directly protect the airway. It assists in preventing food from entering the nasal cavity.
D. The pharynx is the passageway for both air and food, but it does not provide protection to the airway during swallowing. The epiglottis is the main structure responsible for this protection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. The endoplasmic reticulum (ER) is involved in the synthesis of proteins and lipids, but it is not responsible for ATP production.
B. Lysosomes are responsible for breaking down waste materials and cellular debris, but they do not play a role in ATP production.
C. Mitochondria are the powerhouses of the cell, where ATP is produced through cellular respiration. They convert nutrients into energy, making them the primary site for ATP production.
D. Ribosomes are responsible for protein synthesis, not ATP production. They are found in the cytoplasm and on the rough endoplasmic reticulum.
Correct Answer is B
Explanation
A. Respiratory bronchioles are part of the lower respiratory tract and lead to alveolar sacs, but they themselves are not primarily responsible for gas exchange. Their role is in the conduction of air.
B. Alveolar sacs are the primary site of gas exchange in the lungs. These sacs contain alveoli, where oxygen and carbon dioxide are exchanged between the air and the blood. This is the correct answer.
C. The pleura are double-layered membranes surrounding the lungs and do not play a direct role in gas exchange. They reduce friction and allow for smooth lung expansion.
D. Pulmonary veins carry oxygenated blood from the lungs back to the heart, but gas exchange occurs in the alveolar sacs, not the veins.
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