Physiology and the Concept of Homeostasis. Plasma Membrane. Membrane Potential. Electrical Signals. Synaptic Transmission. The Nervous System.The Spinal Cord. Pain. The Automatic Nervous System. The Endocrine System. The Reproductive System. Skeletal Muscle. Smooth Muscle. Cardiac Physiology. Cardiac Output. The Circulatory System. Blood and Hemostasis. The Immune System. The Respiratory System. The Digestive System. The Renal System.