Study of body function -- Chemical composition of the body -- Cell structure and genetic control -- Enzymes and energy -- Cell respiration and metabolism -- Interactions between cells and the extracellular environment -- The nervous system: Neurons and synapses -- The central nervous system -- The autonomic nervous system -- Sensory physiology -- Endocrine glands: Secretion and action of hormones -- Muscle: Mechanisms of contraction and neural control -- Heart and circulation -- Cardiac output, blood flow, and blood pressure -- Immune system -- Respiratory physiology -- Physiology of the kidneys -- Digestive system -- Regulation of metabolism -- Reproduction