Cells Wiki - What is the cells?
The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life". The study of cells is called cell biology. Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids. Organisms can be classified as unicellular (consisting of a single cell; including bacteria) or multicellular (including plants and animals). While the number of cells in plants and animals varies from species to species, humans contain more than 10 trillion (1013) cells. Most plant and animal cells are visible only under a microscope, with dimensions between 1 and 100 micrometres.Cells were discovered by Robert Hooke in 1665, who named them for their resemblance to cells inhabited by Christian monks in a monastery. Cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure and function in all living organisms, and that all cells come from pre-existing cells. Cells emerged on Earth at least 3.5 billion years ago..
What does the word cells mean? Find synonyms, antonyms and the meaning of the word cells in our free online dictionary! Find words starting with cells and anagrams of cells.
Definitions of "cells"
- Plural form of cell. noun
The word "cells" in example sentences
It is covered with a layer of epithelial cells, some of which have small, hair-like projections and are known as the _hair cells_.. [Physiology and Hygiene for Secondary Schools]
The air passages are _kept clean_ by cells especially adapted to this purpose, known as the _ciliated epithelial cells_.. [Physiology and Hygiene for Secondary Schools]
The cells supply the basis for the body organization and, properly speaking, the body is _an organization of cells_ (5) (Recall the definition of an organization, page 10.). [Physiology and Hygiene for Secondary Schools]
In the further history of the egg the smaller cells, called _polar cells_, take no part, since they soon disappear and have nothing to do with the animal which is to result from the further division of the egg.. [The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity]
B, cells of a fusiform or spindle shape found in the loose tissue under the skin and in other parts (called _connective-tissue cells_);. [A Practical Physiology]
The red marrow consists of a small quantity of connective tissue, bloodvessels, and numerous cells (Fig. 72), some few of which are fat cells, but the great majority are roundish nucleated cells, the true marrow cells of Kölliker.. [II. Osteology. 2. Bone]
Secondary cells, commonly called _storage cells_ and _accumulators_, consist always of two inert plates of metal, or metallic oxide, immersed in an electrolyte which is incapable of acting on either of them until a current has first been passed through the electrolyte from one plate to the other.. [Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc.]
All the forms of cells so far considered may be quite properly termed _wet cells_ because of the fact that a free liquid electrolyte is used.. [Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc.]
Since the cells which are adapted to give constant current are commonly used in connection with circuits that are continuously closed, they are called _closed-circuit cells_.. [Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc.]
Your healthcare provider can use a cotton swab to collect fluid and skin cells from the herpes blister or sore, and then send them to a lab to look for evidence of the herpes virus.. [Genital Herpes]
The lack of brain cells is staggering when exposed to the light of day.. [Think Progress » Global warming is a ‘nightmare’ for coffee.]
To progress to nucleoprotein cells from the ribocyte era, the RNA cell must devise translation.. [An Interesting Pattern]
Besides, I'm sure that maintaining healthy brain cells is overrated and somehow unattractively bourgeois.. [Archive 2008-09-01]
Their existence within cells is secured by some distinct cellular mechanisms that would not be present in a prebiotic environment.. [Bits and Pieces of an RNA World]
It lifts dry and damaged skin cells from the surface to allow the enzymes to get to work.. [Kate Somerville Skin Health Experts Where Hollywood Gets Its Glow On]
To only make new cells is however not sufficient, certain cells must also die at specific time points as a natural part of the growth process.. [The Nobel Prize in Physiology or Medicine 2002 - Presentation Speech]
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