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rhythmical wave-like muscular contractions of a duct in order to cause movement of substances within it.
middle body tissue layer that forms the muscular, circulatory and excretory systems.
a molecule that is formed when oxygen and haemoglobin combine chemically.
the structure that separates the right ventricle from the pulmonary artery. It prevents the...
meristem that produces a layer of bark on the outer surface of a plant.
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.