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the blood circuit from the heart to the lungs and back to the heart.
the structure that separates the right ventricle from the pulmonary artery. It prevents the...
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
the space in the middle of the tooth which contains cells, blood vessels and a nerve.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...