![]() This means that blood is pumped through the heart twice when it makes a full circuit of the body, which ensures that blood circulation isn’t too slow.Īdvantages of a double circulatory system: Mammals have a double circulatory system.It is made up of the heart and various blood vessels. The circulatory system is responsible for transporting blood around the body.In the case of humans (mammals), it is closed, where blood is confined to blood vessels only, and double. Circulatory systems can be opened or closed and single or double.This supplies blood to the cardiac muscle, the heart. The coronary artery wraps around the heart.It prevents oxygenated and deoxygenated blood from mixing. The septum consists of muscle and connective tissue.They prevent the flow of blood back into the heart. The semilunar (SL) valves connect the ventricles to the arteries (pulmonary artery and aorta).Tricuspid valve separates the right atria from the right ventricle the bicuspid/mitral valve separates the left atria from the left ventricle.This can happen due to the pressure inside. Tendinous chords, also known as valve tendons, prevent atrioventricular valves turning inside out.They stop blood flowing back into the atria when the ventricles contract and are also known as the tricuspid and bicuspid valves.Ī-level Biology – The Structure of the Heart The atrioventricular (AV) valves connect the atria to the ventricles.They only open when there is higher pressure behind the valve, and this ensures that blood only flows in one direction (is unidirectional), preventing back flow. The valves of the heart only open one way.Pulmonary artery, which allows the blood to travel from the right ventricle to the lungs.Vena cava, which allowed deoxygenated blood from the body to enter the heart at the right atrium.Aorta, where blood flows from left atrium to body.Pulmonary vein, where blood flows from lungs to left atrium.4 main blood vessels are located in the heart:.This is because they have to pump blood a further distance than the atria (out of the heart and to the rest of the body) and withstand higher pressures. The ventricles have thicker walls than the atria.They receive blood that is returning to the heart and force blood into the ventricles. The right and left atria lie above the right and left ventricles, all separated by valves. The right side pumps deoxygenated blood to the lungs, whereas the left side pumps oxygenated blood to the whole body. ![]() The heart consists of two muscular pumps that lay next to each other.It is a muscle that pumps blood around the body. The heart is the control for the circulatory system. ![]() Structure of The Heart (A-level Biology) Structure of The Heart Human Heart The Structure of Human Heart
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