Physiology of circulation

Blood flows through the right atrium in order to enter the heart. Thus deoxygenated blood enters the superior vena and carried venous blood from the head and neck region while the inferior vena cava carries blood from lower and upper extremities to include the trunk. The deoxygenated venous blood enters the right atrium and from there into the right ventricle via the tricuspid valve. The blood in the right ventricle then enters the infundibulum which is its outflow channel. It then proceeds through the infundibulum to enter the pulmonary trunk after passing through the pulmonary valve. Further more, it  enters the two pulmonary arteries to reach the lungs where it is oxygenated. Oxygenated blood now passes into four pulmonary veins to enter the left atrium from where it passes through the mitral valve into the left ventricle. From the left ventricle blood passes through the left ventricular outflow channel called the aortic vestibule before reaching the aortic valves which passes the blood into the aorta.









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Lymphatic drainage

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