Biomechanics principles. Physics of hearing and vision. Fluid mechanics and human circulatory system. Viscosity and viscoelasticity in biological fluids. Thermodynamics of biochemical reactions and metabolism. Random molecular motion in gases and solutions. Electrolytes. Molecular and ionic interactions in solutions. Membrane's structure and properties. Diffusion and osmosis in biological organisms. Electrochemistry of cells. Action potential and electrical activity of neurons.