Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The trachea contains O-shaped rings of hyaline cartilage.
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22. The Respiratory System
Introduction to Lung Physiology
Problem 4
Textbook Question
The function of the epiglottis is to:
a. Contract muscularly to cover the laryngopharynx
b. Vibrate to produce sound
c. Trigger a cough reflex
d. Cover the glottis during swallowing
Verified step by step guidance1
Step 1: Begin by identifying the anatomical location and structure of the epiglottis. The epiglottis is a flap of elastic cartilage located at the entrance of the larynx, above the glottis.
Step 2: Understand the primary function of the epiglottis. Its role is to prevent food and liquid from entering the respiratory tract during swallowing.
Step 3: Analyze the swallowing process. During swallowing, the epiglottis folds down to cover the glottis (the opening to the larynx) to ensure that food and liquid are directed into the esophagus instead of the trachea.
Step 4: Eliminate incorrect options based on the function of the epiglottis. For example, the epiglottis does not contract muscularly, vibrate to produce sound, or trigger a cough reflex. These functions are associated with other structures like the vocal cords or the larynx.
Step 5: Conclude that the correct answer is related to the epiglottis covering the glottis during swallowing, as this aligns with its anatomical role in protecting the airway.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Epiglottis Function
The epiglottis is a flap of cartilage located at the root of the tongue. Its primary function is to prevent food and liquid from entering the trachea during swallowing. When swallowing occurs, the epiglottis folds down to cover the glottis, ensuring that the airway is protected and directing the food towards the esophagus.
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Swallowing Mechanism
Swallowing is a complex process that involves the coordinated action of various muscles and structures in the throat. It consists of three phases: the oral phase, where food is chewed and formed into a bolus; the pharyngeal phase, where the bolus is pushed into the throat; and the esophageal phase, where it moves down the esophagus. The epiglottis plays a crucial role in the pharyngeal phase by sealing off the airway.
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Glottis
The glottis is the part of the larynx that contains the vocal cords and the opening between them. It is essential for sound production and plays a role in breathing. During swallowing, the glottis must be covered by the epiglottis to prevent aspiration, which is the entry of food or liquid into the airway, potentially leading to choking or respiratory issues.
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