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Chap 33 - White Blood Cells
Chap 33 - White Blood Cells

... A. neutrophils and macrophages 1. destroy bacteria, viruses, and injurious agents 2. enter tissue via: a. diapedesis b. ameboid motion c. chemotaxis - draws cells toward inflamed tissue B. phagocytosis 1. rough surfaces - phagocytosis 2. substances of body have protective protein coats - foreign par ...
MODULE 01 Classification Cells and Cell Structure
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DBCO–Cy5 - Kerafast

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Classification of Bacteria
Classification of Bacteria

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G protein-coupled receptor - Bryn Mawr School Faculty Web Pages
G protein-coupled receptor - Bryn Mawr School Faculty Web Pages

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Cell
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Chemotaxis



Chemotaxis (from chemo- + taxis) is the movement of an organism in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment. This is important for bacteria to find food (e.g., glucose) by swimming toward the highest concentration of food molecules, or to flee from poisons (e.g., phenol). In multicellular organisms, chemotaxis is critical to early development (e.g., movement of sperm towards the egg during fertilization) and subsequent phases of development (e.g., migration of neurons or lymphocytes) as well as in normal function. In addition, it has been recognized that mechanisms that allow chemotaxis in animals can be subverted during cancer metastasis.Positive chemotaxis occurs if the movement is toward a higher concentration of the chemical in question; negative chemotaxis if the movement is in the opposite direction. Chemically prompted kinesis (randomly directed or nondirectional) can be called chemokinesis.
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