Final answer:
The primary function of superficial veins is to transport deoxygenated blood back to the heart. They are part of the cardiovascular system that ensures blood circulation and maintains the body's homeostasis.
Step-by-step explanation:
The primary function of superficial veins is to transport deoxygenated blood back to the heart. Veins are a crucial part of the cardiovascular system, which manages the circulation of blood and maintains homeostasis within the body. While arteries carry oxygenated blood from the heart to the rest of the body, veins carry the deoxygenated blood, now lacking in oxygen and enriched with carbon dioxide and other waste products, from the body back to the heart.
This deoxygenated blood then travels to the lungs where carbon dioxide is exchanged for oxygen before returning to the heart to be pumped back out to the body. Superficial veins, which are closer to the skin, can dilate or enlarge, particularly in conditions where venous return is compromised or when the body is trying to release excess heat.