Which of the following allow red blood cells to flow through one cell at a time?

Question

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Capillaries are the smallest blood vessels in the body and allow for the exchange of gases, nutrients, and waste products between the blood and the tissues. Their narrow diameter allows red blood cells to flow through one cell at a time, ensuring efficient exchange. Arteries, ventricles, aortas, and atrium are not capable of allowing one red blood cell at a time and are designed for different functions such as transporting blood away from the heart (arteries) or receiving blood from the body or lungs (ventricles and atrium).

Which of the Following Allow Red Blood Cells to Flow