Aerobic Respiration

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The document discusses how cells obtain and use energy through aerobic respiration. It asks a series of questions about why cells need energy, how they get it from food, and what they release. Cells need energy for processes like cell division, movement, and maintaining body temperature. They get this energy through respiration, which is the chemical reaction of glucose and oxygen that releases carbon dioxide, water, and energy. This reaction takes place in the mitochondria of cells.

Educação Tecnologia Negócios

Aerobic Respiration Investigating Cells Standard Grade Biology

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Why do living cells need energy? ,[object Object],[object Object],Cell Division Movement Synthesis Maintaining Body Temperature

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How do cells get their energy? ,[object Object],[object Object],[object Object],[object Object],[object Object],Glucose + Oxygen [Energy] Carbon Dioxide Water + +

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Photosynthesis and respiration are reactions that complement each other in the environment. They are in reality the same reactions but occurring in reverse. While in photosynthesis carbon dioxide and water yield glucose andoxygen, through the respiration process glucose and oxygen yield carbon dioxide and water. They work well since living organisms supply plants with carbon dioxide which undergoes photosynthesis and produces glucose and these plants and bacteriagive out oxygen which all living organisms need for respiration. Photosynthesis is a process that converts carbon dioxide into organic compounds in presence of sunlight. Respiration is the set of metabolic reactions that take in cells of living organisms that convert nutrients like sugar into ATP (adenosine tri phosphate) and waste products. Processes in photosynthesis are divided on basis of requirement of sunlight while respiration processes are divided on basis of requirement of oxygen. Hence in photosynthesis you have the light dependent reactions and the dark reactions while inrespiration there is aerobic respiration and anaerobic respiration. In photosynthesis light dependent reactions, ultra violet light strikes chlorophyll pigments which excites electrons leading to separation of oxygen molecules from carbon dioxide. In the dark reactions, carbon molecules now independent of oxygen are converted into carbohydrates and stored in plant cells as energy and food source. In aerobic cellular respiration oxygen is utilized to convert organic compounds into energy and in anaerobic respiration converts organic compounds into energy without using oxygen.

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A living organism is a highly complex and unstable system. Its existence is precarious because of its complexity. Metabolism is the sum total of all biochemical reactions designed to maintain and replicate the structure of the organism and to counteract a continuous drive towards an increase in the disorder, or entropy, of the system. To build complex structures requires energy, i.e., a system needs energy for synthesis and maintenance. Human metabolism derives energy from degradation of organized structures (food) from plants, and, therefore, indirectly from the sun. In more affluent societies of the world, a significant amount of energy is obtained from animals which themselves have survived by utilizing plants and other animals. For the most part, food represents complex organic molecules which require energy to be synthesized and therefore can yield energy by being destroyed. (Food also contains some constituents which are not utilized for energy production, but have important roles in maintaining life, e.g., minerals and vitamins.)

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