Multiple Choice
In introductory lung physiology, what is the main function of the respiratory system?
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22. The Respiratory System
Introduction to Lung Physiology
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In human physiology, which organ is the primary site of gas exchange and is considered the main organ of the respiratory system?
A
Heart
B
Lungs
C
Liver
D
Kidneys
Verified step by step guidance1
Understand the function of the respiratory system, which is primarily responsible for the exchange of gases (oxygen and carbon dioxide) between the body and the environment.
Identify the organ where gas exchange occurs: this organ must have a large surface area and be in close contact with blood vessels to facilitate the diffusion of gases.
Recall that the lungs contain millions of tiny air sacs called alveoli, which provide the surface area needed for efficient gas exchange.
Recognize that the heart, liver, and kidneys have different primary functions: the heart pumps blood, the liver processes nutrients and detoxifies, and the kidneys filter blood to produce urine.
Conclude that the lungs are the main organ of the respiratory system and the primary site of gas exchange in human physiology.
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