In human beings, energy release involves taking in food and chemically changing it by the process of oxidation
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YES that is true . when we take in the food  during the process of respiration the glucose is broken down to pyruvic acid CH3COC0OH BY THE process of glycolysis , initially by taking oxygen by cytoplasm . when it gets more oxygen the pyruvic acid enters mitochondria and is converted to CO2 AND H20 . This cycle is called KREB's cyle . the synthesis of ATP molecule takes place in the F1 particle of mitochondria . \nthe equaton is \nC6H12O6+O2---->CH3C0COOH + O2--->CO2 + H20 \nthis process is called aerobic trespiration \nrespiration invoves oxidation of food ....\nPLEASE VOTE IT AS THE BEST ANSWER IF YOU LIKE IT ..PLEASE......\nI THINK I HAVE ANSWERED YOUR MANY QUERIES
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Most of the energy in every process that uses it is lost (transforms to heat). The best processes in nature use about 33% of the energy, and release the other 67% as heat.\nWhen an organism eats another organism, it only eats the energy that the "lower" organism transformed to material (biomass) - and here the energy is lost (all the energy an organism transforms to movement/breath, all the organimsm that die and their energy goes to a lower link in the chain, and the biomass an organism loses in excrement).
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Dont you mean how a molecule of glucose releases energy in a cell....any which way you look at it...refer to Kreb's Cycle in your Biology textbook!
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Metabolism is a measure of how quickly chemical reactions take place in the body. (Since these require energy it is often referred to syonmously as energy use). \n\nDifferent people have different metabolic rates, mostly based on the proportion of their body weight that is made up of lean muscle mass which one of the most metabolically active in the  body (the nervous system and the liver are more active but make up smaller percentages of the body so their effect is neglegable by comparison).\n\nWhen energy is generated from food storage (glocose or fatty acid chains), a couple of different "metabolic" pathways can be taken. First gluclose can be converted anerobically into pyruvate and two high-energy ATP andeosene-tri-phospate molecules. Then it may be further processed in a mitochondria in a process called the Krebs cycle into ATP, CO2, and water. Fatty acid chains, unfortunately, can only be processed aerobically. After some pre-processing they can also enter the Krebs cycle.
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You really need to be specific here.  Everything is a chemical - the food we eat, the air we breathe, etc.
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The energy comes from all the food they eat.  Gloucose is a yummy one.  :)
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heat is a form of energy.
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released from muscle stores as a form of energy
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You are probably referring to metabolism.  Metabolism is a collection of chemical reactions that takes place in the body's cells to convert the fuel in the food we eat into the energy needed to power everything we do, from moving to thinking to growing. Specific proteins in the body control the chemical reactions of metabolism, and each chemical reaction is coordinated with other body functions. In fact, thousands of metabolic reactions happen at the same time - all regulated by the body - to keep our cells healthy and working.
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Respiration, Reproduction, Locomotion and Consumption
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The energy that carnivores obtain from their diet is the chemical energy of molecules in the food.  As they metabolize (oxidize) food molecules, energy is released which is trapped and temporarily stored in the form of ATP molecules.\n\nPlants, on the other hand, absorb light.  The chlorophyll and other pigment molecules in the chloroplasts absorb light, and through the processes in chloroplasts, they are able to use that light energy to produce ATP and to produce electrons that are then available for use by the cell.
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metabolism that requires the presence of oxygen
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Breathing, the process whereby an organism (living thing) obtains oxygen from its surroundings, to take part in internal chemical reactions which break down food to release energy. Breathing also usually gives out waste carbon dioxide as an unwanted by-product of these reactions. Breathing is one aspect of respiration, which is a term that includes both physically obtaining oxygen, and also using it in chemical pathways inside cells to release energy—the process of cellular respiration\n\nMany aquatic animals obtain oxygen dissolved in the water by muscle-powered movements, such as when the forward motion of a fish or the pumping actions of its mouth and throat force a flow of water over its gills ( See also Fish). This is underwater breathing. Tiny organisms “breathe” by the process of passive seepage or diffusion of oxygen through their body surfaces. Plants also obtain oxygen by diffusion from the air or water around them, usually into the leaves.
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Pr0n.\n\n\nSeriously, the heat is generated from the oxidation (burning) of fuel (mostly glucose) within the cells (mitochondria).  Just as oxidation of gasoline creates heat & energy, so does the controlled, catalytic (enzymatic) oxidation of sugar - it's what we live on!!
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Carbon, Hydrogen, and oxygen are what they are essentially made of but there are many different elements in the human body, that come through consumption.
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Metabolism is basically a measure of the body's ability to use oxygen to burn up fuel abtained from food.  Thhe body has a survival mechanism to compensate for too little or too much food over a significant period of time.  For example, a person can fast for a day drinking only water or longer under medical supervision.  During that time, the body conserves fuel (fat) by lowering its metabolic rate.  After about a month of fasting, the body may suffer starvation where body tissue including heart muscle begin to be used up as fuel.  That can be very dangerous and depends on initial body weight.
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Cellular respiration is the process in which the chemical bonds of energy-rich molecules such as glucose are converted into energy usable for life processes. Oxidation of organic material—in a bonfire, for example—is an exothermic reaction that releases a large amount of energy rather quickly. The equation for the oxidation of glucose is:\n\nC6H12O6 + 6O2 → 6CO2 + 6H2O + Energy released (2830 kJ mol−1) \nIn a fire there is a massive uncontrolled release of energy as light and heat. Cellular respiration is the same process but it occurs in gradual steps that result in the conversion of the energy stored in glucose to usable chemical energy in the form of ATP. ATP is known as the universal currency because when the phosphoanhydride bonds in ATP are hydrolyzed in an exergonic reaction, the energy yield is 30kJ per mole under standard conditions. Waste products (CO2 + H2O) are released through exhaled air, sweat and urine.