The Heart's Highway: Understanding Blood Flow with Animations

The heart is divided into four main chambers, with the atria on top and ventricles below.The septum is a thick muscular wall that divides the heart into right and left sides.The upper chambers are called atria. The right atrium receives deoxygenated blood from the body, while the left atrium receives oxygenated blood from the lungs.Below are the ventricles. Notice how the left ventricle has a much thicker wall, as it needs to pump blood to the entire body.The heart has four valves that act as one-way gates, preventing blood from flowing backward.The tricuspid valve controls flow between the right atrium and ventricle.The mitral valve, also called the bicuspid valve, controls flow between the left atrium and ventricle.The pulmonary valve controls blood flow from the right ventricle to the pulmonary artery.And finally, the aortic valve controls blood flow from the left ventricle to the aorta.The left ventricle's thick muscular wall is crucial for generating the high pressure needed to pump blood throughout the entire body.Deoxygenated blood returns to the heart through two major veins.The superior and inferior vena cava deliver deoxygenated blood to the right atrium.Blood flows through the tricuspid valve into the right ventricle.The right ventricle contracts, pushing blood through the pulmonary artery to the lungs.In the lungs, blood picks up oxygen from the air we breathe, changing from dark red to bright red.The oxygenated blood returns to the heart through the pulmonary veins, entering the left atrium.The systemic circuit begins as oxygen-rich blood enters the left atrium.Blood flows through the mitral valve into the powerful left ventricle.The left ventricle contracts forcefully, pushing blood through the aortic valve into the aorta.From the aorta, oxygen-rich blood is distributed to all organs and tissues through a network of arteries.As organs use the oxygen, the blood becomes deoxygenated and returns through veins back to the heart.The systemic circuit works continuously alongside the pulmonary circuit, maintaining constant oxygen delivery throughout the body.Thanks for learning about the circulatory system with Spark.E!