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the main blood vessel that returns deoxygenated blood from the head and thorax to the right atrium of the heart.
when a person uses their breath to help another person who has stopped breathing, in an attempt...
a social structure in which different classes are determined by heredity.
the main vein that returns deoxygenated blood from the lower parts of the body to the right...
neurons that have two outgrowths coming directly from the cell body.
the tube that carries urine from the nephrons to the ureter via the renal pelvis.