Typically, engineered wood products are made from the same hardwoods and softwoods used to manufacture lumber. Sawmill scraps and other wood waste can be used for engineered wood composed of wood particles or fibers, but whole logs are usually used for veneers, such as plywood, MDF or particle board.
Mucus is a slippery secretion of the lining of various membranes in the body (mucous membranes). It is a viscous colloid containing antiseptic enzymes (such as lysozyme) and immunoglobulins. Mucus is produced by goblet cells in the mucous membranes that cover the surfaces of the membranes.
Causes of Green Mucus. Mucus is often secreted in excess in certain conditions, especially in respiratory tract infections. It may originate from from the nose of mouth (catarrh) or from lower down the respiratory tract (sputum, phlegm). Rarely, it may emanate from the upper esophagus. 1  Colds. 2  Flu (infleunza). 3  Hay fever. 4  Sinusitis.