Oh, my bleeding heart! In this BrainPOP movie, Tim and Moby discuss the human heart and how it works! First, learn about the size, functions, and parts of the heart. See out how your heart is different from other muscles in your body, and how its two pumps create your heartbeat. Discover how your heart pumps used and fresh blood in a special way to keep you healthy and alive, and how long it takes for blood to circulate once through your entire body. Plus, find out why your heartbeat gets faster, harder and louder when you’re running around. Your heart works so hard and never gets a vacation!