Text, illustrations, and exercises are utilized in a set of nine learning modules designed to instruct nursing and allied health students in a variety of biological topics. The first module, by Barbara Cathey, discusses cell growth and the proliferation of cells in benign and malignant tumors. The second module, by Eugene Volz, describes the functions of the various types of white blood cells and explains how to identify them under the microscope. The third module, by Oliver H. Duggins, investigates the basic types of neurons and the physiology of a nerve impulse. The fourth module, by Leland Van Fossen, details the functions of the organs along the digestive tract. The fifth module, by Reba Douglass Grubb, identifies the sequential events in the development and transmission of infectious disease. The sixth module, by S. W. Lavinger, describes the parts of flowering plants and the conditions necessary for their growth and development. The seventh module, by Barbara L. Turk, introduces the basic principles of medical and surgical asepsis. The eighth module, by A. Louise Jones, describes the varying presence of antigens and antibodies in differing blood types and examines the types of blood that recipients can receive from donors. The ninth module, by Betty K. Grayson, explains the use of blood pH levels and arterial blood gas values in diagnosing respiratory and metabolic acidosis and alkalosis. Each module provides reinforcement exercises and a post-test. (JP)