Cellular+respiration

= CELLULAR RESPIRATION =

Cell food + oxygen --> energy + carbon dioxide (C6H12O6 + 6O2 --> 6H2O + 6 CO2 + energy)

Everyon needs energy to work, we get this energy from the foods we eat. The best way for cells to harvest energy stored in food is through cellular resperation, a catabolic pathway for the production of adenosine triphosphate (ATP). ATP, is a high energy molecule, is expended by working cells. Cellular respiration occurs in both eukaryotic and prokaryotic cells. It has three main stages: glycolysis, the citric acid cycle, and electron transport.




 * Glycolysis**:

The word glycolysis means "splitting sugars." It is a six carbon sugar, that is seperated into two molecules of a three carbon sugars. During this process 2 molecules of ATP, 2 molecules of pyruvic acid and 2 "high energy" electrons result in the creation of NADH molecules.. Glycolysis will happen with or without oxygen. Instead of oxygen, glycolysis can be the first step of cellular respiration. If there is no oxygen, glycolysis will produce ATP. This is called fermentation.


 * The Citric Acid Cycle**:

The Citric Acid Cycle happens when the two molecules of the three carbon sugars (in glycolysis) are changed to a different compound. This compound, called nicotinamide adenine dinucleotide, are worn down in the process. These reduced forms carry the "high energy" to the next step in this process. The Citric Acid Cycle can only take place when oxygen is present.




 * Electron Transport**:

Electron transport needs direct oxygen. electron transport is a group of electrons found in the membrane of the mitochondria in eukaryotic cells. Through a series of reactions, the electrons are passed to oxygen. In the end a gradient is formed, and ATP is produced.


 * why is chemical reaction important life?**

Well chemical reaction is a process in which 2 or more substances are combined and make a chemical change. chemical reaction is important because it happens all around us. with out chemical reaction we would not have air for us to breath, food for us to eat, medicines for us to be a good health when sick and building materials to build.


 * Why do we need chemical reaction?**

Without chemical reaction we wouldn't have the necessities for a healthy life. For example, medicine wouldn't be created because it is two substances combined together. Photosynthesis is also a chemical reaction. Without it we wouldn't have oxygen to breathe. The tools we use to build and work are actually chemical reactions.

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