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How the body works: the cell

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Cells are the microscopic building blocks of the body Among the smallest human cells are some nerve cells while the largest cell, the ovum, has a diameter of 5.100,007 inch. the size of a pin point. Each cell is a self contained living unit which becomes modified and specialized as it develops and is integrated into the body systems. When actual funtioning cells in tissues and organs are packed together in closed proximity, they take on a variety of shapes Muscle cells, for example, are elongated into fibres. Liver cells are hexagonal, and the cells which lie in the intestine are column shaped. The cut-away view of a generalized cell as presented here and magnified to six thousand times the average size reveals the working parts concerned with systems of self support maintenance, repair and multiplication. The cell nucleus, a spherical structure, contains the basic genetic material, or DNA. in the form of chromosomes. The nucleus controls the overall activity of the cell. The nuclear envelope is a two layered membrane surrounding the nucleus. The alveolus acts as a sieve controlling the continuos flow of chemicals to and from the nucleus The nucleolus, housed within the nucleus, has under a microscope, a granular appearance. this is due to its concentration of ribonucleic acid or RNA Cytoplasm is the watery medium of the cell in which all the structures are suspended. Most of the work of the cell is carried on in the cytoplasm. The cell membrane is a soft pliable skin, which acts as a control gate for the entry and exit of substances involved in cell function The endoplasmic reticulum is a network of flattened sacs and tubes which provides a communication channel from materials passing between the nucleus and the cell's environment. The lysosomes are simple sacs which store enzymes the powerful chemicals involved in digestion The mithocondria are the main sites of energy production within the cell. Pits on the surface of the cell, capture fluid which contains large molecules, such as proteins and carriy it towards the interior. The ribosomes are the sites where proteins are made They contain RNA similar to that in the nucleus. The centrioles are involved in cell division during which they move apart to opposite poles of the cell leaving a delicate tracery within the cytoplasm. And golgiĀ“s complex acts as a depo for the storage and secretion of cell products Working around the clock, the human cell is comparable to a small factory Like a factory, the cell takes in a continuous flow of raw materials from processing and packaging of its own chemical waste, ready for disposal

Video Details

Duration: 3 minutes and 9 seconds
Country: United Kingdom
Language: English
Genre: None
Views: 1,531
Posted by: lolaceituno on Sep 24, 2008

It describes the different parts of the cell and their functions

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