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Across 1. unit of energy produced and used by the body to carry out all bodily functions 5. breakdown of carbohydrates 10. Primary source of ATP at rest and during low-intensity activities. Uses primarily carbohydrates and fats as substrates 12. Energy-releasing reactions that are generally catabolic. 13. breakdown of large molecules into smaller molecules; destructive metabolism. 14. The synthesis of larger molecules from smaller molecules 15. the sequence of reactions by which most living cells generate energy during the process of aerobic respiration

Down 2. Require energy and include anabolic processes and the contraction of muscle. 3. occurs at moderate-high intensities, uses the breakdown of carbohydrates to provide energy 4. When exercise intensity is low enough and oxygen is present 6. _____ used primarily in high-intensity, short-term activities 7. cause of fatigue 8. end result of glycolysis is production of _____ 9. The flow of energy in a biological system; the conversion of macronutrients into energy. 11. The total of all the catabolic or exergonic and anabolic or endergonic reactions in a biological system.