Question

Which statements about blood vessels are correct?

• A. Arteries eventually give rise to capillaries.
• B. Arteries have thicker walls than veins.
• C. Blood flows at a higher pressure in veins than in arteries.
• D. Tissues exchange substances with blood through veins.

Answer 1

Answer: (A), (B)

Arteries have thicker walls than veins.

Arteries branch to form arterioles and arterioles branch to form capillaries. Tissues exchange substances with blood through capillaries. Capillaries join to form venules which then join to form veins.
Blood flows to arteries directly from the heart, and hence is at a higher pressure than in veins. Hence, arteries have thicker walls to withstand the pressure.