Biology 0.0 / 5 ? Applied ScienceThe heart and blood vesselsASOCR Created by: gitaxxCreated on: 17-04-16 12:09 The heart's structure has four chambers with one way flaps called? Valves 1 of 15 The atria relaxation- blood enters the atria from the pulmonary veins or vena cava. Atrial diastole 2 of 15 These are the upper chambers and they receive blood that is being returned to the heart. Atria 3 of 15 This receives blood with little oxygen because blood has already circulated throughout the body delivering oxygen and nutrients. Right atrium 4 of 15 This sends an electrical impulse to the atria. Sinoatrial node 5 of 15 Atrial contraction- blood is pumped into the ventricles. Atrial systole 6 of 15 Through this, the electrical impulse continues, an area between the atria and the ventricles Atrioventicular node 7 of 15 There's less muscle and elastic tissue to allow flow of blood under lower pressure Veins 8 of 15 Has a thick muscle layer to resist pressure changes Artery 9 of 15 This fills with newly oxygenated blood returning from the lungs. Left atrium 10 of 15 Ventricular contraction- blood is forced through the pulmonary artery to the lungs and through the aorta to the rest of the body. Ventricular systole 11 of 15 They're lined with a single layer of endothelial cells Capillaries 12 of 15 Has valves to prevent back flow of blood. Veins 13 of 15 Ventricular relaxation- the bicuspid and tricuspid valves open and the next pumpful of blood enters the ventricles from the atria. Ventricular diastole 14 of 15 How much blood does the heart pump per minute around the body. 5 dm^3 or 5 litres+ 15 of 15
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