PHED-3126EL Lecture Notes - Lecture 5: Energy, Human Musculoskeletal System, Chemical Energy
28 Dec 2019
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Document Summary
Chapter 5 fundamental of human energy transfer. Body"s capacity to extract energy from food nutrients and transfer to contractile elements in skeletal muscle determines capacity to move. Energy transfer occurs through thousands of complex chemical reactions that require a proper mixture of macro/micronutrients continually fueled by o2. The term energy suggests a dynamic state related to change; thus, presence of energy emerges only when change occurs. Energy be created or destroyed, but only transformed from one state to another without being depleted. Conservation of energy: chemical energy stored within the bonds of macronutrients does not immediately dissipate as heat during energy metabolism, large portion remains as chemical energy, which musculoskeletal system then changes into mechanical energy. Constitute system"s total energy: releasing potential energy transforms basic ingredient into kinetic energy of motion. Bound energy in one substance directly transfer to another substance to increase potential energy: provides required energy for biosynthesis.
