Anatomy and Physiology - The human brain and spinal cord control bodily functions via nerve fibers, transmitting sensory information [1] - The brain is described as a soft, dense tissue, likened to tofu or pork roast in texture [3] - The human body is composed of 50 trillion molecular entities [3] Biological vs Mechanical Perspective - The text contrasts the organic nature of the human body with the mechanical nature of machines [2] - The text cautions against treating the human body like a machine that can be pushed without rest [2] Brain Function - The brain processes auditory information, such as voice [3]