Cells Capture and Release Energy

Today we have a substitute and we hy ave to read 2.2 page 47 in our book. What we read was that...
Animal cells get energy from food, while plant cells get energy from sunlight. All cells use chemical energy. Chemical energy is the energy stored in the bonds between atoms of every molecule. A major source for most cells is stored in a sugar molecule called glucose. You need food energy to run, walk and even sleep. When you run, muscle cells realease chemical energy from glucose to move your legs.

Some cells capture light energy.
The source of energy for almost all organisms ultimatly comes from sunlight. PLants change the energy in sunlight into a form of energy their cells can use- ---the chemical energy in glucose. Photosynthesis is the prosses that plant cells use to change the energy from sunlight into chemical energy. Photosynthesis takes place in plant cells that have chloroplasts. Chloroplast contains chlorophyll, a light absorbing pigment or colored substance that traps the energy in sunlight. The prosses of photosynthesis involves a series of chemical steps. An exsample... 6CO2+6H2O-->C6+H12+O6+6O2.
1. The starting materials of photosynthesis is carbon dioxide and water. The plant takes in carbon dioxide from the air and water from the soil.
2. The process takes place when carbon dioxide and water enters the plants chloroplasts. Chlorophyll captures energy from sunlight which is used to change carbon dioxide and water into new products.
3. The products of photosynthesis are oxygen and sugars such as glucose. The plant releases most of the oxygen to the air as a waist product and keeps the glucose for its energy needs.

Cellular Respiration, cells use oxygen to release energy stored in the sugars such as glucose. In fact, most of the energy used by the cells in your body is provided by cellular resporation. Mitochondria is used in cellular respiration, but chloroplasts is used in photosynthesis. Fermentation is the process by which cells release energy without oxygen. There are two types of fermentation, alcoholic and lactic acid fermentation. Some bacteria release energy through lactic acid fermentation. .......................CA





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