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Download Food is a fuel Raw materials can only enter or leave the cell through
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Food is a fuel Raw materials can only enter or leave the cell through the cell membrane A fuel is a source of stored energy Living cells require energy to drive the chemical reactions that keep them alive Large, complex chemical compounds in food are broken down chemically (digested) into soluble molecules that can cross the cell membrane Glucose (sugar)+ oxygen -> carbon dioxide + water + energy Animal cells obtain energy from the chemical compounds contained in other animals or plants C6H12O6 + O2 -> CO2 + H2O + energy Respiration Respiration happens in structures called mitochondria inside all living cells All cells require water as a medium for chemical reactions to take place The chemical reaction between oxygen and glucose releases energy (it is an exothermic reaction) Nutrition Unwanted by-products of chemical reactions in the cell are expelled into the surroundings (excreted) through the cell membrane. In animals, large complex chemical compounds in food are broken down (digested) into soluble energy-rich molecules that can cross the cell membrane Energy stored in food is transferred to cells by chemical reactions Green plants use energy transferred by sunlight to combine carbon dioxide and water, producing glucose and oxygen. Photosynthesis CO2+H2O — energy transferred by sunlight -> C6H12O6+O2 Photosynthesis happens in structures called chloroplasts inside plant cells The raw materials for respiration must be available to the cell from its immediate surroundings.
