oxygen
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Glucose must first enter cells through a transport protein called GLUT. Once inside, glucose is broken down through a series of chemical reactions in a process called glycolysis to produce ATP, the cell's main energy source.
Plants are able to convert sunlight into energy through the process of photosynthesis, which allows them to produce their own food in the form of glucose. When we eat plants, we are able to obtain this energy stored in the form of glucose, which our bodies can then convert into usable energy through processes like cellular respiration.
It depends on what kind of "living thing" you are asking about. In cellular respiration, animals must combine oxygen with glucose to produce ATP- their energy source. In photosynthesis, Plants combine carbon dioxide and water, in the presence of sunlight to produce ATP and NADPH, which make glucose. Other living things use different chemicals. Many chemosynthetic bacteria use sulfides!
To get energy from stored glycogen, the body must first convert glycogen into glucose. This process, known as glycogenolysis, breaks down glycogen into glucose molecules, which can then be utilized for energy production through glycolysis and cellular respiration. The resulting glucose can be used immediately for energy or stored as fat if in excess.
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Oxygen must combine with the fuel in a process known as combustion in order to produce energy. During combustion, the fuel is oxidized and releases energy in the form of heat and light.
Oxidative phosphorylation and Krebs cycle
Glucose must be present in order for cellular respiration to occur. Cellular respiration is the process in which glucose is broken down in to ATP (energy), Carbon Dioxide, and water. Glucose is a reactant in the sense that it must be present for the reaction to occur.
Glucose must first enter cells through a transport protein called GLUT. Once inside, glucose is broken down through a series of chemical reactions in a process called glycolysis to produce ATP, the cell's main energy source.
Plants use light energy to make glucose.
For carbohydrates to be oxidized or burned for energy, they must first be broken down into simple sugars (glucose) through the process of digestion. Glucose can then enter cells and undergo further processes such as glycolysis and the citric acid cycle to produce energy in the form of ATP.
In order to extract energy from glucose, it must be combined with oxygen through a process called cellular respiration. This process breaks down glucose molecules into smaller units, releasing energy that can be used by the cell.
Carbon dioxide must be transformed by plants through the process of photosynthesis to produce oxygen and glucose, which serves as a source of energy for the plant.
Humans get glucose primarily through the digestion of carbohydrates in their diet. Carbohydrates are broken down into glucose during the digestion process and absorbed by the body to be used as an energy source. Additionally, the liver can produce glucose through a process called gluconeogenesis to maintain blood sugar levels when needed.
Plants are able to convert sunlight into energy through the process of photosynthesis, which allows them to produce their own food in the form of glucose. When we eat plants, we are able to obtain this energy stored in the form of glucose, which our bodies can then convert into usable energy through processes like cellular respiration.
Oxygen, Carbon Dioxide, water, and ADP/ATP are all recycled during photosynthesis and respiration. Energy is not recycled so there must be a continuous supply of energy to maintain the cycle.