Question

question 1 of 10
a structure in the leg of a human is found to carry oxygen - rich red blood cells.
what else is most likely true about this structure?
a. it is part of the respiratory system.
b. it carries blood away from the heart.
c. it also carries carbon - dioxide - rich blood.
d. it contains alveoli.

Explanation:

• Option A: The respiratory system (lungs, trachea, etc.) is not in the leg. So this option is wrong.
• Option B: Arteries carry oxygen - rich blood away from the heart. If a structure in the leg carries oxygen - rich red blood cells, it is likely an artery. This option is correct.
• Option C: Veins carry carbon - dioxide - rich blood. Since the structure carries oxygen - rich blood, it is not a vein. So this option is wrong.
• Option D: Alveoli are in the lungs (respiratory system), not in the leg. So this option is wrong.

Answer:

B. It carries blood away from the heart.