Tissues grow either because their cells increase in number or because the existing cells grow larger. Most embryonic and childhood growth occurs by hyperplasia40 (HY-pur-PLAY-zhuh), tissue growth through cell multiplication. Exercised muscles grow, however, through hypertrophy41 (hy-PUR-truh-fee), the enlargement of preexisting cells. Neoplasia42 (NEE-oh-PLAY-zhuh) is the development of a tumor (neoplasm)—whether benign or malignant—composed of abnormal, nonfunctional tissue.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.