General & Systemic Pathology
Define the following:
1a. Atrophy: decrease in size, number, and function; can be applied to tissues, organs, or cells.
1b. Hypoplasia: failure to grow to normal size; usually applied to a tissue or organ and indicates that there are fewer or smaller cells.
1c. Aplasia: failure to grow; usually meaning a complete absence of a cell type, organ or tissue (agenesis).