PATHOLOGY MCQ
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following are features of the alveoli that adapt them to gas exchange?I. High surface areaII. Thin wallsIII. Dry surfaces
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I and II only
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I only
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II and III
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I, II and III
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Explanation:
Detailed explanation-1: -Large surface area to allow faster diffusion of gases across the surface. Thin walls to ensure diffusion distances remain short. Good ventilation with air so that diffusion gradients can be maintained. Good blood supply to maintain a high concentration gradient so diffusion occurs faster.
Detailed explanation-2: -moving air in and out of your lungs (ventilation) oxygen-carbon dioxide exchange (diffusion) pumping blood through your lungs (perfusion)
Detailed explanation-3: -They have a large surface area relative to the volume of the organism. They are thin and so have a short diffusion pathway. They have a moist surface where gases can dissolve first before they diffuse in or out. More items
There is 1 question to complete.