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(also called the pith) the central part of the stem that consists of large, thin-walled parenchyma cells with intercellular airspaces
a molecule that is formed when oxygen and haemoglobin combine chemically.
the outermost nucleated cytoplasmic layer of the Schwann cells that surrounds the axon of a...
the active maintenance of the correct balance of water and solutes in the blood and tissue fluid...
blood vessels that transport deoxygenated blood from the heart to the lungs.