In our body we have several different cells like: brain cells, skin cells, liver cells, and stomach cells. All cells have a "skin" called the plasma membrane- protecting it from the outside environment. The cell membrane regulates the movement of water, nutrients and wastes into and out of the cell.
(http://web.jjay.cury.edu/acarpi/NSC/13-cells.htm)


IMPORTANT!!!! ORGANELLES
There are two important organelles in a cell. Ribosome and mitochondrion- ribosomes participate in protein synthesis and mitochondria are referred to as the power plants of the cell because many of the reactions that produce energy take place in mitochondria.
(http://web.jjay.cury.edu/acarpi/NSC/13-cell.htm)


LIFE of a cell is called lysosomes
Lysomomes are organelles that contain enzymes that aid in the digestion of nutrient molecules and other materials.

CELL STRUCTURE AND PROCESS

CHLOROPLAST
Structure-composed of a double layer of modified membrane-inner membrane invaginates to form layers called "grana" where chlorophyll is concentrated
Function-site of photosynthesis

CENTRIOLE
Structure-nine triplets of microtubulus form one centriole- two centrioles form one centrosome
Function- forms spindle fibres to separate chromosomes during cell division

ENDOPLASMIC RETICULUM
Structure-sheets of unit membrane with ribosomes on the outside-Forms a tubular network throughout the cell
Function-transports chemicals between cells and within cells- provides a large surface area for the organization of chemical reactions and synthesis

RIBOSOME
Structure-non-membraneous, shpherical bodies composed of RNA and protein synthesis
Function-site of protein synthesis

GOLGI APPARATUS
Structure-stacks of flattened sacs of unit membrane-vesicles pinch off the edges
Function-modifies chemicals to make them functional-secretes chemicals in tiny vesicles-stores chemicals-may produce endoplasmic reticulum

MITOCHONDRIA
Structure-composed of modified double unit membrane-inner membrane infolded to form cristae
Function-site of cellular respiration-the release of chemical energy from food

LYSOSOME
Structure-membrane bound bag containing hydrolytic enzymes
Function-break large molecules into small molecules by inserting a molecule of water into the chemical bond.

(http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/cells.htm)

Cells
Cell- The cell is the structural and functional unit of all living organisms, and is sometimes called the "building block of life." (http://en.wikipedia.org/wiki/cell_(biology)



Humans are multicellular- Humans have an estimated 100 trillion cells. A typical cell size is 10um and a typical cell mass is 1 nanogram. (http://en.wiki.peidia.org/wiki/cell_(biology)