The site where exchange of materials (CO2,O2) occurs between the circulatory system and the body cells is? (where the cell meets the __ ) vein arteriole artery capillary

The correct answer is **capillary**.<br /><br />Capillaries are the smallest blood vessels and the site where exchange of materials like oxygen (O2), carbon dioxide (CO2), nutrients, and waste products occurs between the blood and the body's tissues. Arteries and arterioles carry blood away from the heart, while veins carry blood back to the heart. While exchange does occur across the walls of larger vessels to a small degree, the primary location for this vital exchange is the capillary bed due to its thin walls and vast network throughout the body.<br />