Deoxyganted blood appears blue and oxygenated blood appears red. Does anyone know why the heart has four chambers? This is because the heart recieves both oxygenated blood from the lungs and deoxygenated blood from the body so this must be kept separate. The heart has four chambers as you can see – the right atrium, left atrium, right ventricle and left ventricle. All the diagrams you look at you need to make sure you know your rights from your left.The left hand side on this diagram is your right and right hand side on this diagram is actually your left and this is becauseYour looking at the heart from the front.They have strong fibres and cords to stop them turning inside out. They stop the blood flowing back from the ventricles into the atria. The atrioventricular (AV) valve lie between the atria and ventricles. They prevent backflow of blood into the ventricles. The semi-lunar valves are found in the aorta and pulmonary artery. The Pulmonary vein is connected to the left atrium and brings The pulmonary artery is connected to the right ventricle and carries The vena cava is connected to the right atrium and bringsĭeoxygenated blood back from the tissues of the body. The aorta is connected to the left ventricle and carries oxygenatedīlood to all parts of the body except the lungs. The direction of blood flow through the heart is maintained be valves Why is the left ventricle wall thicker than the right ventricle wall? LO = Recall the structure of the heart andĮXTENSION: Why are the walls of atria thinner than the walls of the ventricles and Remember about the structure of the heart. On a post it note, come up with any terms you know or can P3 outline the gross structure of all the.

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