A professional who conducts research on cellular structure and organ-system functions of plants and animals. Responsibilities include:

• Studies growth, respiration, circulation, excretion, movement, reproduction, and other functions of plants and animals under normal and abnormal conditions.
• Performs experiments to determine effects of internal and external environmental factors on life processes and functions, using microscope, x-ray equipment, spectroscope, and other equipment.
• Studies glands and their relationship to bodily functions.
• May specialize in physiology of particular body area, function, or system.
• May specialize in physiology of animals and be designated Animal Physiologist; of plants and be designated Plant Physiologist; of human organisms and be designated Medical Physiologist.