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UCLA EMT - CARDIOLOGY EXAM STUDY GUIDE 2025 QUESTIONS AND ANSWERS Describe the blood flow through the heart, including the chambers, pulmonary circulation, and valves. - ....ANSWER ...-First, the deoxygenated blood enters the heart through the superior and inferior vena cava. The deoxygenated blood then fills up in the right atrium. The tricuspid valve opens allowing the blood to fill up the right ventricle. When the right ventricle contracts, the pulmonary valve opens and the deoxygenated blood travels through the pulmonary artery and goes to the lungs. In the lungs, the CO2 in the blood exchanges with the O2 in the alveoli and the blood becomes oxygenated. The blood then returns to the heart through the pulmonary veins into the left atrium. The mitral valve opens and the left ventricle is filled with oxygenated blood. When the ventricle contracts, the blood goes through the aortic valve and into the aorta as it supplies oxygenated blood to the rest of the body. ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1