Chalk Walk

We crafted a masterpiece on the hallway floor. As you can see in the video, oxygen-deprived blood enters the heart from the upper body through the superior vena cava, and from the lower body through the inferior vena cava. The blood enters the right atrium, then goes through the tricuspid valve into the right ventricle after the atrium contracts. There, the blood goes to the lungs through the pulmonary valve and out the pulmonary arteries to be reoxygenated. From the lungs, blood reenters the heart through the pulmonary veins, entering the left atrium. Blood then goes through the bicuspid valve into the left ventricle, the largest and strongest chamber of the heart, and through the aortic valve to the aorta, where it is pushed to the rest of the body.