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Did you lose an achievement? Loading. Mitosis and Meiosis. CELLpics - Cell Biology for Schools. Nikon MicroscopyU. Cells.
Macromolecules. Photosynthesis lab...very good. 5th grade all the way up ... | Educ... Interactive Concepts in Biochemistry - Interactive Animations. VCAC: Cellular Processes: Electron Transport Chain: The Movie. Education. The simple story of photosynthesis and food - Amanda Ooten. Photosynthesis. Photosynthesis Interactive General. Biology - Research Overview. Concepts in Biochemistry - Interactive Animations. Microscope Imaging Station. Stem Cells: Cells with Potential. What are stem cells? Your body contains over 200 types of cells, each with a specific job: blood cells carry oxygen; muscle cells contract so that you can move; nerve cells transmit chemical signals. The job of a stem cell is to make new cells. It does this by undergoing an amazing process—differentiating, or changing into another type of cell.
Each time a stem cell divides, one of the new cells might remain a stem cell while the other turns into a heart, blood, brain, or other type of cell. In fact, stem cells are able to divide to replenish themselves and other cells without any apparent limit. Stem cells are the source, or “stem,” for all of the specialized cells that form our organs and tissues.
There are many kinds of stem cells, but two types have made frequent appearances in the news: embryonic stem are present in very early—and very tiny—embryos, and produce the first cells of the heart, brain, and other organs. Next: Why invest so much in studying stem cells? Cell division. Apoptosis. The Control of the Cell Cycle. Cell Osmosis | Biology, Cells. Mechanism of Urine Concentration.