Explanation:

- Arteries

- Correct Answer

- Carry oxygen-rich blood away from the heart to the body.

- Have thick, muscular walls to handle high pressure.

- Capillaries

- Connect arteries and veins.

- Facilitate exchange of oxygen, carbon dioxide, and nutrients.

- Have thin walls for easy exchange.

- Veins

- Carry blood back to the heart.

- Often carry oxygen-poor blood.

- Have valves to prevent backflow.

- Septum

- A wall separating the left and right sides of the heart.

- Not involved in carrying blood around the body.