Multiple Choice
A very deep inspiration that ventilates all alveoli is called:
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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
Gas exchange in the lungs is facilitated by:
A
the thin walls of alveoli and their extensive capillary network
B
the presence of thick cartilage in the bronchi
C
active transport of oxygen across the alveolar membrane
D
the high solubility of nitrogen in blood plasma
Verified step by step guidance1
Understand the process of gas exchange: Gas exchange in the lungs involves the movement of oxygen from the air into the blood and carbon dioxide from the blood into the air. This occurs in the alveoli, which are tiny air sacs in the lungs.
Analyze the structure of alveoli: The alveoli have very thin walls (one cell thick) to allow for efficient diffusion of gases. This thin barrier minimizes the distance oxygen and carbon dioxide need to travel.
Consider the role of the capillary network: The alveoli are surrounded by an extensive network of capillaries. This close proximity ensures a large surface area for gas exchange and maintains a concentration gradient for oxygen and carbon dioxide.
Evaluate the options: Thick cartilage in the bronchi does not facilitate gas exchange; it provides structural support. Active transport is not involved in gas exchange, as it occurs via passive diffusion. Nitrogen has low solubility in blood plasma and does not play a significant role in gas exchange.
Conclude the correct answer: The thin walls of alveoli and their extensive capillary network are the primary factors that facilitate efficient gas exchange in the lungs.
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