السؤال 3

Which vessel type is best suited for exchanging gases and dissolved nutrients with nearby tissues?

An artery with a thick muscular wall
A vein containing one-way valves
A capillary with a very thin wallالإجابة الصحيحة
A chamber inside the heart

الشرح

Capillary walls are extremely thin, so substances can move between blood and surrounding cells across a short distance. Arteries mainly distribute blood and have thicker walls, making them a poor choice for the principal exchange site.

الشرح

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