Multiple Choice
Which two processes together constitute ventilation in the respiratory system?
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40. Circulatory System
Gas Exchange
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which feature of the alveoli allows for the ease of diffusion of gases?
A
They contain a high concentration of hemoglobin
B
They are lined with cilia to move mucus
C
They have a low surface area to volume ratio
D
Their walls are only one cell thick
Verified step by step guidance1
Understand the function of alveoli: Alveoli are tiny air sacs in the lungs where gas exchange occurs. Oxygen diffuses into the blood, and carbon dioxide diffuses out of the blood into the alveoli.
Recognize the importance of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. For efficient gas exchange, the structure of alveoli must facilitate this process.
Analyze the structural features of alveoli: Alveoli have thin walls that are only one cell thick, which minimizes the distance gases need to travel during diffusion. This structural feature is crucial for efficient gas exchange.
Compare the options provided: Evaluate each option to determine which one aligns with the structural feature that facilitates diffusion. For example, hemoglobin is found in red blood cells, not alveoli, and cilia are involved in moving mucus, not gas exchange.
Conclude that the correct feature is the thin walls of alveoli: The thin, one-cell-thick walls of alveoli reduce the diffusion distance, making gas exchange efficient and easy.
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