1. What type of blood vessel shown in the diagram is : A) an artery. B) A capillary. C) A vein. D) None of the above 2. At which location would blood with a low oxygen content and a high carbon dioxide content be found?

3. The diagram is based on structures found in which respiratory organ?

1. The blood vessel shown is a capillary.

2. The location where low oxygen blood and high carbon dioxide blood would be found is marked with the letter A in the diagram.

3. The diagram is based on structures found in the lungs, specifically the scheme of a pulmonary alveolus.

Explanation:

The scheme shows a pulmonary alveolus in contact with the corresponding pulmonary capillary, in addition to the alveolar blood flow. Between both structures is the capillary-alveolus barrier, through which gas exchange occurs.

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