Phylum Sarcodina

Phylum Sarcodina - dysentery (also known as Montezuma's...

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Phylum Sarcodina: Amoebae The amoeboids are in the phylum Sarcodina, which includes approximately 40,000 species. They engulf their prey with pseudopods, cytoplasmic extensions formed as cytoplasm streams in one direction. Traditional;ly this group has included the amoebas, foraminifera, and radiolaria; some of which have been removed to other groups due to recent studies. Many amoeboids have shells, as do the foraminifera and radiolaria. Amoeba proteus , shown in Figure 18, is a commonly studied member. When amoeboids feed, they phagocytize their food; the pseudopods surround and engulf a prey item. Digestion then occurs within a food vacuole. Freshwater amoeboids, including Amoeba proteus , have contractile vacuoles used to eliminate excess water. Entamoeba hystolitica is an intestinal parasite in humans that causes amoebic
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Unformatted text preview: dysentery (also known as Montezuma's Revenge or the Aztec Two-step). It is present in the water supply of many communities in Mexico (and other countries), and unless specifically filtered, toxins from this amoeba will cause a disease that can ruin a vacation. Over time, your body will acclimate to the toxins, but since many of us only are exposed for short times, our bodies will not be able to cope. Drinking filtered water should prevent contacting this illness. The Bad Bug Book website has a description of this illness . Amoeba moves by extensions of their cytoplasm known as pseudopodia. Pseudopodia, shown in Figure 18, are used by many cells, and are not fixed structures like flagella but rather are associated with actin near the moving edge of the cytoplasm....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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