Question

Write two differences between arteries and veins.

Hint:

Remember the rule of thumb: \textbf{A}rteries = \textbf{A}way from the heart.

Answer 1

Step 1: Understanding the Concept:
The human circulatory system relies on different types of blood vessels to transport blood throughout the body. The major distinct types are arteries, veins, and capillaries.

Step 2: Detailed Explanation:
Direction of flow: Arteries carry blood pumped \textit{away} from the heart to various organs. Veins collect blood from organs and carry it \textit{back} to the heart.
Wall Structure: Because arteries carry blood under high pressure directly from the heart, they have thick, highly elastic muscular walls. Veins carry blood under lower pressure, so their walls are thinner and less elastic.
Valves: To prevent the backward flow of blood against gravity (especially in the legs), veins contain internal valves. Arteries do not require valves due to the high forward pressure.

Step 3: Final Answer:
Two major differences are the direction of blood flow and the structural presence of valves in veins but not arteries.