What is the name of the structure labeled X in the diagram?
Understand the Problem
The question presents a diagram of a part of the respiratory system and asks for the identification of the structure labeled 'X'. The options provided are 'bronchus', 'bronchiole', 'trachea', and 'alveolus'.
Answer
The structure labeled X is an alveolus.
The structure labeled X is an alveolus. Alveoli are tiny air sacs in the lungs that allow for gas exchange.
Answer for screen readers
The structure labeled X is an alveolus. Alveoli are tiny air sacs in the lungs that allow for gas exchange.
More Information
Alveoli are the terminal air sacs of the respiratory system. The walls of the alveoli are extremely thin, allowing for efficient gas exchange between the air and the blood. Humans have approximately 480 million alveoli.
Tips
Students may confuse alveoli with bronchioles, which are the smaller branches of the bronchi that lead to the alveoli.
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