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specialised heart muscle tissue between the right atrium and right ventricle which conducts the normal electrical impulse from the atria to the ventricles.
epithelial tissue consisting of a single layer of cells.
breaking down of large nutrient molecules using chemical means (e.g. through the action of...
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...
the part of the lung where the bronchi, bloodvessels and nerves enter and leave the lungs.