Multiple Choice
In the context of lung physiology, which body system primarily removes carbon dioxide (CO2) from the blood?
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22. The Respiratory System
Introduction to Lung Physiology
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Which structure is NOT part of the respiratory system?
A
Trachea
B
Alveoli
C
Esophagus
D
Diaphragm
Verified step by step guidance1
Step 1: Understand the components of the respiratory system. The respiratory system primarily includes structures involved in the process of breathing and gas exchange, such as the nasal cavity, pharynx, larynx, trachea, bronchi, lungs, alveoli, and diaphragm.
Step 2: Identify the function of each listed structure. The trachea is the windpipe that conducts air to the lungs; alveoli are tiny air sacs where gas exchange occurs; the diaphragm is a muscle that helps in breathing by contracting and relaxing to change thoracic volume.
Step 3: Recognize the esophagus's role. The esophagus is a muscular tube that carries food and liquids from the throat to the stomach and is part of the digestive system, not the respiratory system.
Step 4: Compare the esophagus with the other structures. Since the esophagus does not participate in air conduction or gas exchange, it is not part of the respiratory system.
Step 5: Conclude that the esophagus is the structure that is NOT part of the respiratory system, unlike the trachea, alveoli, and diaphragm.
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