BPK 105 Lecture Notes - Lecture 11: Mitral Valve, Tricuspid Valve, Pulmonary Artery
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13 Apr 2020
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Module 7/8: deoxygenated blood enters the right atrium from the systemic circulation through the superior and inferior vena cava, and from heart muscle through the coronary sinus. From the right atrium, blood flows into the right ventricle through the tricuspid valve. As the right ventricle begins to contract, the tricuspid valve will force close, and the pulmonary semilunar valve is forced open, and the blood flows into the pulmonary trunk. As the right ventricle relaxes, pressure in the pulmonary trunk increases, and the backflow of blood forces the pulmonary semilunar valve to close. The pulmonary trunk branches into the right and left pulmonary arteries which carry blood to the lungs, where oxygen is picked up. Oxygenated blood returning from the lungs enters the left atrium. When the left atrium contracts, enough blood will flow from the left atrium through the bicuspid valve and into the left ventricle.
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