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PSL201 – Mar 4 – Endocrine 6 Energy Metabolism.docx

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Department
Physiology
Course Code
PSL201Y1
Professor
Michelle French

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PSL201Mar 4 Endocrine 6 Energy MetabolismAn Overview of WholeBody Metabolismenergy metabolism the way your body stores and utilizes energybecause food intake is intermittent the body must tor nutrients during periods of intake and then break them down between meals blood glucose levels must be maintained because the brain depends on glucose Energy Intake Utilization and Storage 1 biomolecules can be broken down to smaller molecules in the process releasing energy that can be used for driving cellular processes 2 biomolecules can be used to synthesize other molecules needed by cells for normal function growth and repair 3 biomolecules in excess of those required for energy and synthesis of essential molecules are converted to energy storage molecules that provide energy between mealsCarbohydratesusually found as glucose in the bloodstream transported by glucose transportersonce in a cell o amino acids are used for protein synthesis o catabolized for energy by proteolysis o can be oxidized for energy o can be converted to glycogen for storage o glycogen can be broken down to glucose by glycogenesisProteinsAA rather than proteins are transported in the bloodIn cells o AA are used for synthesis of proteins o AA are catabolized for energy by proteolysis o proteins function as AA stores and can be broken back down to AAFattriglycerides are transported in the bloodstream as lipoproteins protein lipid containing particlestriglycerides at the outer surface of lipoproteins are broken down by the enzyme lipoprotein lipase o located inside surface of capillaries throughout the body and very dense I adipose tissue o breaks down triglyceride into fatty acids and monoglyceridesinside cells o can be oxidized for energy o combined with glycerol to form triglycerides and stored in fat dropletsususally occurs in adipocytes
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