Cell Function - 8th Grade Science. M. Reichmreich7thgradescience.webs.com/pp 7-2.1, cell function...
Transcript of Cell Function - 8th Grade Science. M. Reichmreich7thgradescience.webs.com/pp 7-2.1, cell function...
Cell Function
Mrs. Reich’s Class
Cell
The cell is the smallest unit of life that conducts all life
http://www.mcb.uct.ac.za/tutorial/virusentanimal_files/cell400.jpg
Functions• Each cell has major
structures (organelles) within it that perform these life functions.
• Many organelles are too small to be seen without the aid of a microscope.
• Cells in organisms vary in size and shape, but contain most of the same major parts.
http://media-2.web.britannica.com/eb-media/85/78585-004-A63E1F47.jpg
Cell membrane• The thin, flexible outer covering of a cell. It controls
what enters and leaves a cell.
http://www.williamsclass.com/SeventhScienceWork/ImagesCells/CellMembrane.jpg
Structure and Function of the Cell Membrane.
• Diffusion is one way in which materials (for example molecules of sugar or water) move across the cell membrane. It occurs as materials are moved from an
area of higher concentration to an area of lower concentration.
http://arditobook.pbworks.com/f/626px-Simple_difussion_in_cell_membrane.svg.png
Structure and Function of the Cell Membrane.
• Osmosis is the diffusion of water across a membrane.
http://library.stratfordhall.bc.ca/osmosis_files/osmosisdiffusion.gif
Structure and Function of the Cell Membrane.
Cytoplasm
· The gel-like fluid inside of a cell made of mostly water.
· The other organelles are embedded in the cytoplasm.
http://www.daylilies.org/ahs_dictionary/cytoplasm.gif
Structure and Function of the Cell Membrane.
Nucleus
· Contains the genetic material (DNA) and is the control center of the cell.
http://www-personal.umich.edu/~sarhaus/courses/NRE530_F1998/jaley/pictures/nucleus.gif http://elliottcelltour.com/files/QuickSiteImages/Nucleus.jpg
Structure and Function of the Cell Membrane.
Vacuole
· Act as temporary storage centers.
· Some store water; others store waste products until they can be eliminated from the cell.
http://wpcontent.answers.com/wikipedia/en/thumb/e/e0/Biological_cell_vacuole.svg/400px-Biological_cell_vacuole.svg.png
Structure and Function of the Cell Membrane.
Chloroplasts
· Are the sites where photosynthesis takes place in a plant cell.
· They contain the chlorophyll used to make food.
http://www.rkm.com.au/CELL/Plant/plantcellimages/chloroplast.jpg http://micro.magnet.fsu.edu/cells/chloroplasts/images/chloroplastsfigure1.jpg
Structure and Function of the Cell Membrane.
Mitochondria
· Are the energy producing sites in the cell where respiration takes place.
· It is sometimes called the “powerhouse” of the cell.
http://employees.csbsju.edu/hjakubowski/classes/ch331/oxphos/mitochondria.gif
Structure and Function of the Cell Membrane.
Cell wall
· Provides support and shape for plant cells. It is made mostly of cellulose.
http://www.astrographics.com/GalleryPrints/Display/GP2164.jpg
Movie on Cells Discovery
• http://player.discoveryeducation.com/index.cfm?guidAssetId=C62B5787-5748-4990-A4BA-BB2381F375EB&blnFromSearch=1&productcode=US