Answer :
The exchange of nutrients, oxygen, and waste products between the blood and the cells throughout the body occurs across the cells lining the capillaries.
What are capillaries?
Your body is filled with tiny blood channels called capillaries. To the cells in your organs and bodily systems, they deliver blood, nutrients, and oxygen. The tiniest blood veins in your circulatory system are called capillaries.
Capillaries complete the circulatory system by connecting arteries to veins:
Arteries carry oxygen-rich blood from the heart to your organs.
Veins help the body remove low-oxygen blood and waste.
Therefore, the thin capillary walls allow the exchange of nutrients, oxygen and waste products between the blood and cells all around the body.
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