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Nucleus: The Command Center of the Cell Structure, Functions, Types, and Medical Significance 1. Introduction to the Nucleus The nucleus is one of the most vital components of a eukaryotic cell. Known as the "brain" or "command center" of the cell, it controls cellular functions, stores genetic information, and directs growth and reproduction. For biology students, medical professionals, and especially Doctor of Physical Therapy (DPT) students, understanding the nucleus is essential to grasp cellular physiology, pathology, and therapeutic approaches. 2. What is the Nucleus? The nucleus is a membrane-bound organelle present in most eukaryotic cells. It houses the cell’s DNA and is responsible for maintaining the integrity of genes and regulating gene expression.  Definition: “The nucleus is a double membrane-bound organelle that contains the genetic material (DNA) and coordinates the cell's activities such as growth, intermediary metabolism, protein syn...