QQuestionBiology
QuestionBiology
"Gas exchange in the lungs is facilitated by:
Select one:
A. Adequate amounts of surfactant.
B. Pulmonary capillary constriction.
C. Water or blood within the alveoli.
D. Surfactant-destroying organisms."
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Answer
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Step 1:I'll solve this problem step by step, focusing on the key concepts of gas exchange in the lungs.
Step 2:: Understand the Physiology of Gas Exchange
Gas exchange occurs in the alveoli, the tiny air sacs in the lungs where oxygen and carbon dioxide are transferred between the air and blood.
Step 3:: Analyze the Key Requirements for Effective Gas Exchange
Effective gas exchange requires: - Thin alveolar walls - Large surface area - Proper fluid balance - Ability to prevent alveolar collapse
Step 4:: Evaluate Each Option
Option A: Adequate amounts of surfactant - Surfactant is a crucial substance that reduces surface tension in the alveoli - It prevents alveolar collapse and makes breathing easier - CORRECT: Surfactant is essential for proper gas exchange Option B: Pulmonary capillary constriction - This would REDUCE blood flow, hindering gas exchange - INCORRECT Option C: Water or blood within the alveoli - Fluid in alveoli would BLOCK gas exchange - INCORRECT Option D: Surfactant-destroying organisms - These would IMPAIR gas exchange - INCORRECT
Final Answer
Adequate amounts of surfactant Explanation: Surfactant is critical for maintaining alveolar structure and facilitating efficient gas exchange by reducing surface tension and preventing alveolar collapse.
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