From which heart chamber do the pulmonary arteries originate?

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Pulmonary arteries originate from the right ventricle. The right ventricle ejects blood into the pulmonary trunk, which then divides into the right and left pulmonary arteries to carry deoxygenated blood to the lungs for oxygenation. In contrast, the left ventricle sends oxygenated blood into the aorta for the systemic circulation, and the atria receive blood rather than pump it to the lungs.