AP BIOLOGY

Detailed explanation-1: -Two large veins that lead into the heart are the superior vena cava and inferior vena cava.

Detailed explanation-2: -Arteries and veins link your heart to the rest of the circulatory system. Veins bring blood to your heart. Arteries take blood away from your heart. Your heart valves help control the direction the blood flows.

Detailed explanation-3: -Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.