Regarding arteries, veins, and capillaries: describe differences between their tunics, their internal pressures, and why they are constructed in the manner they are.
ANSWER :
Anatomical structure of both arteries and veins is almost same, however there are some specific difference that make that unique to their function. Arteries have more thicker tunica media (smooth muscle layer), and lesser lumen because in that blood flow with greatest pressure (systolic) to the systemic circulation of the body, while in veins have comparably less thicker tunica media layer, and larger lumen area due to flow blood with less pressure in the venous circulation.
The capillaries are thinnest blood vessels made up only endothelium layer, and have least blood pressure, because the blood pressure decrease gradually when flow from arteries to veins, venules/arteriole, and capillaries. During their specific anatomical structure they primarily function to exchange materials (nutrients), and some respiratory gases across them into blood.
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