PATHOLOGY

Detailed explanation-1: -Veins become larger and larger as they get closer to the heart. The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.

Detailed explanation-2: -As blood travels through the venous system toward the heart, why do the veins become larger in diameter? The transition causes the resistance to drop further so that the flow rate of blood increases.

Detailed explanation-3: -Veins are closer to the surface of your body, and arteries are deep inside your muscles. The walls of a vein are thinner than an artery. Veins carry blood from your organs and towards your heart. Arteries carry blood away from your heart.