Arteries. These thin, muscular tubes deliver oxygenated blood from the heart to all parts of the body. The aorta is the main artery. It passes from the heart up the chest (descending aorta) and into the stomach (descending aorta). Coronary arteries branch from the aorta into smaller arteries (arterioles) as they approach the heart.

Veins. This return oxygen-depleted blood to the heart. The venules get smaller as they reach the heart. Two principal veins supply the heart. From the head and arms to the heart goes the superior vena cava. The inferior vena cava carries blood from the lower body to the heart. Leg veins feature valves to prevent blood flow backward.

Vena Cava. This delivers blood from different parts of the body to the heart. The vena cava is divided into two parts: superior and inferior. Head, neck, arms, and chest superior vena cava blood flow Lesser vena cava transports blood from lower legs and pelvic regions. The vena cava is the biggest vein.

References
Circulatory system: Anatomy and function. (n.d.). Cleveland Clinic. https://my.clevelandclinic.org/health/body/21775-circulatory-system
NCI Dictionary of cancer terms. (n.d.). National Cancer Institute. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/vena-cava