Your+Cells,+My+Cells,+Everybody's+Cells

=Science Mrs. Gratton =

** The Cell - Part One **
media type="youtube" key="OYmu67fiXqw" width="425" height="350" || __...........................................__ ** || c.1131, "small room," from L. // cella // "small room, hut," related to L. // celare // "to hide, conceal," from PIE base // *kel- // "conceal" (cf. Skt. // cala // "hut, house, hall;" Gk. // kalia // "hut, nest " // kalyptein // "to cover," // koleon // "sheath," // kelyphos // "shell, husk;" L. // cella // "store room," // clam // "secret;" O.Ir. // cuile // cellar," // celim // "hide," M.Ir. // cul // "defense, shelter;" Goth. // hulistr // "covering," O.E. // heolstor // "lurking-hole, cave, covering," Goth. // huljan // "cover over," // hulundi // "hole," // hilms // "helmet," // halja // "hell," O.E. // hol // "cave," // holu // "husk, pod"). Earliest sense is for monastic rooms, then prison rooms (1722). Used in biology 17c., but not in modern sense until 1845. Meaning "small group of people working within a larger organization" is from 1925. // Cellphone // is from 1984.
 * ** What is a cell? ** || ............................................................................................................................................................................
 * ** Where did the word 'cell' come from?

Source: [|Online Etymology Dictionary]

Other Souces:[|Podictionary] || appeared under the microscope to[|Robert Hooke] from [|Micrographia] which is the origin of the word " ** cell ** " being used to describe the smallest unit of a living organism Source: [| Wikipedia: Cells] || It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life.[|[1]] Some organisms, such as most [|bacteria], are [|unicellular] (consist of a single cell). Other organisms, such as [|humans], are [|multicellular]. (Humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 [|µm]; a typical cell mass is 1 [|nanogram].) The largest known cell is an unfertilized [|ostrich] [|egg cell].[|[2]] ||
 * **Who chose to call them cells?** || Drawing of the structure of [|cork] as it
 * **Who chose to call them cells?** || Drawing of the structure of [|cork] as it
 * ** A simple, but accurate definition of "cell" ** || The ** cell ** is the structural and functional unit of all known [|living] [|organisms].
 * ** A simple, but accurate definition of "cell" ** || The ** cell ** is the structural and functional unit of all known [|living] [|organisms].
 * ** One Name....
 * ** One Name....

Many Types ** || Animal Cell Plant Cell || ** cells and ** animal-like ** cells. We say animal-like because an animal type of cell could be anything from a tiny __ [|microorganism] __ to a nerve cell in your brain. Plant cells are easier to identify because they have a protective structure called a __ [|cell wall] __ made of cellulose. Plants have the wall; animals do not. Plants also have organelles like the __ [|chloroplast] __ (the things that make them green) or large water-filled __ [|vacuoles] __. || of organism. __ [|Humans] __ may have hundreds of types of cells. Some cells are used to carry oxygen (O2) through the blood (red blood cells) and others might be specific to the heart. If you look at very simple organisms, you will discover cells that have no defined nucleus ( __ [|prokaryotes] __ ) and other cells that have hundreds of nuclei ( ** multinucleated ** ). The thing they all have in common is that they are compartments surrounded by some type of __ [|membrane] __. ||  ||
 * || There are many types of cells. In biology class, you will usually work with ** plant-like
 * || [[image:cell_over3.gif]] ||
 * || We said that there are many types of cells. Cells are unique to each type
 * **Two More Types -**
 * **Two More Types -**
 * **Two More Types -**


 * Proka** **Two More Types -**


 * Prokaryotes, and the Eukaryotes**

Source: [|Earthlife - Cells] || ** Eukaryotes ** have areas inside the cell separated off from the rest of the cell by membranes, like the cell membrane (see below).

These areas include the n ucleus, numerous mitochondria and other organelles such as the golgi body, and or chloroplasts within each of their cells. These areas are made distinct from the main mass of the cells cytoplasm by their own membrane in order to allow them to be more specialised. You can think of them as separate rooms within your house. The nucleus contains all the cell's DNA, the Mitochondria are where energy is generated, chloroplasts are where plants trap the suns energy in photosynthesis. There are exceptions to every rule of course, and in this case the most obvious two are the red blood cells of animals and the sieve tube elements of plants, which, though living, have no nucleus and no DNA, normally these cells to do not live very long. || Learning By Ms Gratton
 * Links:

Your Cells, My Cells, Everybody's Cells 2

Your Cells, My Cells, Everybody's Cells 3 || ** Prokaryotes ** do not have a nucleus, mitochondria or any other membrane bound organelles. In other words neither their DNA nor any other of their metabolic functions are collected together in a discrete membrane enclosed area. Instead everything is openly accessible within the cell, though some bacteria have internal membranes as sites of metabolic activity these membranes do not enclose a separate area of the cytoplasm. See [|Cells: The Basis of Life] ||
 * || By Laura Utner and Shannon Schoettle ||