Which of the following respiratory structures is characterized by incomplete cartilage rings?
Solution
Correct Answer: Option B
- The trachea, commonly known as the windpipe, is a tubular structure that connects the larynx to the bronchi.
- One of its key anatomical features is the presence of incomplete (C-shaped) cartilage rings.
- These rings provide structural support to keep the airway open, preventing collapse during breathing.
- The open part of the C-shaped cartilage faces posteriorly toward the esophagus, allowing flexibility and expansion of the esophagus during swallowing.
In contrast:
- Bronchioles lack cartilage altogether and are primarily supported by smooth muscle.
- Alveoli are tiny air sacs with very thin walls designed for gas exchange and do not contain cartilage.
- Pharynx is a muscular pathway for air and food that also lacks cartilage rings.
Thus, the presence of incomplete cartilage rings is a distinctive anatomical feature of the trachea.
Reference: Gray's Anatomy, 42nd Edition, Respiratory System, Chapter 8, Page 620
- One of its key anatomical features is the presence of incomplete (C-shaped) cartilage rings.
- These rings provide structural support to keep the airway open, preventing collapse during breathing.
- The open part of the C-shaped cartilage faces posteriorly toward the esophagus, allowing flexibility and expansion of the esophagus during swallowing.
In contrast:
- Bronchioles lack cartilage altogether and are primarily supported by smooth muscle.
- Alveoli are tiny air sacs with very thin walls designed for gas exchange and do not contain cartilage.
- Pharynx is a muscular pathway for air and food that also lacks cartilage rings.
Thus, the presence of incomplete cartilage rings is a distinctive anatomical feature of the trachea.
Reference: Gray's Anatomy, 42nd Edition, Respiratory System, Chapter 8, Page 620
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