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