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( Epithelial, Cardiac, Myocytic, Mitochondrial ) cells form a ( lining, muscle, gland, neuron ) in many different organs and structures. The cells are joined together by ( tight junctions, light junctions, wide junctions, permeable junctions ) which facilitates ( communication, programmed cell death, protein synthesis, mitosis ) and keeps them ( tightly packed, loosely touching, mobile, unspecialised ). Some have cilia, for example in ( the respiratory tract, bone tissue, the cornea, nerve cells ), which help waft ( mucus, lipids, hormones ) and foreign particles up to the throat. Others have microvilli, for example in ( the digestive tract, the liver, glial cells, blood vessel endothelium ), to ( increase, decrease ) surface area and increase rate of ( absorption, digestion, cell division ). These type of cell tend to have ( short, long ) cell life cycles.