LYCOS RETRIEVER 
Animal Cell
built 630 days ago
Endosomes and Endocytosis - Endosomes are membrane-bound vesicles, formed via a complex family of processes collectively known as [E]ndocytosis, and found in the cytoplasm of virtually every animal cell. The basic mechanism of endocytosis is the reverse of what occurs during exocytosis or cellular secretion. It involves the invagination (folding inward) of a cell's plasma membrane to surround macromolecules or other matter diffusing through the extracellular fluid.
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An animal is made up of many thousands of cells, which are used as building blocks. However, as with a house, different types of building blocks are used in different places. Groups of similar cells form a tissue. An example of this is the tissue forming the brain. One of the specialized cells found in this tissue is the neurone or nerve cell. The brain is an organ made up of a number of different tissues.
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The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. Specialized cells that formed nerves and muscles—tissues impossible for plants to evolve—gave these organisms mobility. The ability to move about by the use of specialized muscle tissues is a hallmark of the animal world, though a few animals, primarily sponges, do not possess differentiated tissues. Notably, protozoans locomote, but it is only via nonmuscular means, in effect, using cilia, flagella, and pseudopodia.
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Different methods of mass cultivation of animal cells have been devised to meet the growing demand for these cells. The choice of the method mainly depends on the cells to be used. Basically, cell lines may be roughly divided into those that grow as a suspension and those that are anchorage dependent.
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Illuminating views of the complexities of meiosis, these twelve cell models provide an accurate look at the eight traditional stages of animal meiosis, while graphically illustrating major cell structures. Mounted on a sturdy wooden base for display. Includes detailed key card for structure identification. 20"L x 2"W x 17¾"H
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Animal Cell