You can see as the blood flows from the atria to the ventricles, it goes through the tricuspid & bicuspid valves (also known as the atrioventricular valves). Each heartbeat is a two-part pumping action that takes about one second. The flow of blood through the atria & ventricles is actually happening simultaneously. When the left ventricle contracts, blood goes through the aortic valve, into the aorta, and on to the rest of the body. Blood enters the left atrium, flows through the bicuspid/mitral valve, and into the left ventricle.
Oxygenated blood returns to the heart by way of the pulmonary vein. Blood is pumped from the right ventricle, through the pulmonary valve, into the pulmonary artery and on to the lungs to be oxygenated. Blood flows from the right atrium (mainly by gravity), through the tricuspid valve, and into the right ventricle. Now we will follow the CIRCULATION OF BLOOD THROUGH THE HEART, step by step:įirst we’ll look at the flow of blood through the right side of the heart…īlood enters the heart from the upper & lower body by way of the superior & inferior vena cava. Remember: Veins bring blood towards the heart, arteries carry blood away from the heart (remember “a” for arteries & away). The red portion shows oxygen-rich blood traveling from the lungs through the heart, to the rest of the body. The heart takes in oxygen-poor blood from the body (shown in blue) & delivers it to the lungs, where it gets oxygenated.
The valves are like doors that open & close, preventing blood from flowing backwards – it is the “lub-dub” sound heard with a stethoscope. Aortic valve - between left ventricle & the entrance to the aorta Bicuspid (mitral) valve - between the left atrium & left ventricle & has 2 ‘cusps’ Pulmonary valve - between the right ventricle & entrance to pulmonary artery On the right side of the Heart, we have: - Tricuspid valve - between the right atrium & right ventricle & has 3 ‘cusps’ The heart has 4 valves that control the flow of blood from the atria to the ventricles & from the ventricles into the 2 large arteries connected to the heart. Pericardial fluid: between the layers that reduces friction produced Pericardium: double-layered membrane surrounding the heart You can remember their location, because A comes before V – the atrium is above the ventricle.Ī little larger than the size of your fistĪverage heart beats 100,000 times per day The left ventricle has the thickest muscular wall, having enough force to push blood through the aortic valve & into the body. Each half has an upper collecting chamber – the atrium – and a lower pumping chamber – the ventricle. The heart is divided in half by a muscular wall, the septum. The inner layer, or visceral pericardium, and the outer layer, the parietal pericardium, contain a clear pericardial fluid between them that reduces the friction produced by the pumping action of the heart. The heart is surrounded by a double-layered membrane called the pericardium. The average heart beats 100,000 times per day, pumping about 2,000 gallons of blood. The heart is a four-chambered muscle weighing between 7-15 ounces and is a little larger than the size of your fist. So you can do well on your exam questions about the heart. Understanding & remembering the anatomy of the heart and how blood flows through it can be a daunting task, but hopefully this video will simplify the process, The heart is one of the most amazing organs in the body!
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