250 / FIELDS OF INSTRUCTION lent courses have been taken elsewhere: MED 503, MED 534, BCH 601, BCH 602, BCH 603, BCH 605, MED 520, MED 521, MED 619, MED 620, MED 621, MED 622, MED 623, MED 625, MED 626, MED 627, MED 628, MED 629, MED 636, MED 637, and MED 638. A minor field is not required but may be chosen in another department of the College of Medicine, such as neuroscience or immunology and medical microbiology, or elsewhere in the University in such departments as zoology, chemistry, biochemistry, physics, or psychology. Thesis: Satisfactory completion of a thesis based on research is a re- quirement for a graduate degree. The research may be carried out in any of a number of areas of physiology, including neurophysiology, endocrinology, respiration, circulation, physiology of muscle, environmental physiology, com- parative physiology, and neonatal physiology. COURSES FOR ADVANCED UNDERGRADUATES AND GRADUATES MED 518-VISION. 4 credits MED 520-PRINCIPLES OF PHYSIOLOGY. 5 credits MED 521-LABORATORY IN PHYSIOLOGY. 2 credits GRADUATE COURSES MED 619-PHYSIOLOGY OF RESPIRATION. 3 credits Gas exchange in lungs and tissues. Ventilatory mechanics. Respiratory functions of body fluids. Physiological regulations. Comparative physiology of respiratory mechanisms. MED 620-PHYSIOLOGY OF THE CIRCULATION OF BLOOD. 3 credits Physiology of the component parts of the circulation, relation of structure and function, emphasis on control mechanisms. MED 621-RENAL PHYSIOLOGY. 3 credits Comparative physiology, aspects of renal structure and function covered in seminars. MED 622-PHYSIOLOGY OF THE CENTRAL NERVOUS SYSTEM. 3 credits Special and current problems in brain and spinal cord function covered in seminars. MED 623-NEUROPHYSIOLOGY. 3 credits Physiology of nerve and muscle, central nervous system, and the special senses. Comparative aspects emphasized. MED 625-BODY TEMPERATURE REGULATION. 3 credits Neural and endocrine aspects of temperature regulation, hypo- and hyper- thermia, adaptation to cold and heat, hibernation. Comparative physiology of temperature regulation stressed. MED 626-RECENT ADVANCES IN PHYSIOLOGY. 3 credits Content varies from year to year but covers recent advances in physiology. May be repeated with change of content up to a maximum of 15 credits. MED 627-RESEARCH METHODS IN PHYSIOLOGY. 2 to 6 credits The special needs of each student met by conferences and laboratory work. May be repeated with change of content up to a maximum of 9 credits. MED 628-SEMINAR IN PHYSIOLOGY. 1 credit Graded on an S/U basis.