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Human Anatomy and Physiology BY Elaine N. Marieb: 6th Edition. Cells: The building blocks of all living things Tissues: Groups of cells that are similar in structure and function Nucleus: Control center of cell, contains DNA, necessary for cell reproduction. Nuclear Envelope: Encloses the jelly-like fluid nucleoplasm in which other nuclear elements are suspended Nucleoli: One or more may be present in the nucleus, site of ribosome assembly Chromatin: When a cell is not dividing, its DNA...