amino acids - building blocks of proteins, carbohydrate - compound made up of carbon, hydrogen, and oxygen atoms; major source of energy for the human body, cellular respiration - the process by which cells use oxygen to produce energy from food., chemical digestion - process by which enzymes break down food into small molecules that the body can use., chemical reaction - process that changes one set of chemicals (reactants) into another set of chemicals (product)., fatty acids - building blocks of lipids (fats), glucose - building block of carbohydrates; the form of sugar that circulates in the blood and provides the major source of energy for the body tissues. When its level is low we feel hungry., product - substance produced in a chemical reaction, mechanical digestion - physical breakdown of food (chewing)., reactant - chemical substance that is present at the start of a chemical reaction., protein - a class of nutrients that builds body tissue and supplies energy. protein is made of amino acids, living things levels of organization - cells, tissues, organ, organ system, organism, tissue - a bunch of the same type of cells doing the same job (group of cells with similar structure and function., cell - the basic unit of structure and function of all living things, organ - structure composed of two or more tissue types that performs a specific function for the body., organ system - group of interdependent organs with similar functions., diagnosis - Identification of injury or disease, metabolism - all the chemical reactions that occur within an organism, digestive system - breaks down food. organs: mouth, esophagus, stomach, small intestine, large intestine and anus, circulatory system - transports oxygen and nutrients throughout the body. organs: heart, arteries, veins, blood, respiratory system - supplies blood with oxygen. organs nose, mouth, pharynx, esophagus, larynx, and lungs, nervous system - regulates the other systems. organs brain, spinal cord, nerves, enzyme - a protein that acts as a catalyst to start biochemical reactions, fatigue - extreme tiredness, exhaustion,

Metabolic Reactions 7.3

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