amoeba-3

amoeba-3 - residue is left behind as the amoeba flows on....

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Amoeba 3 Feeding contractile vacuole nucleus pseudopodia closing around prey Amoeba engulfing its prey food vacuole microscopic alga (e.g. Chlamydomonas ) Amoeba feeds on microscopic organisms such as single-celled algae and bacteria. When the amoeba encounters a suitable organism, the cytoplasm flows round the prey and engulfs it, with a drop of water, in a food vacuole. The cytoplasm secretes enzymes into the food vacuole. The enzymes digest the soft parts of the prey and the soluble products are absorbed back into the cytoplasm. Any undissolved
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Unformatted text preview: residue is left behind as the amoeba flows on. Breathing - gaseous exchange Because amoeba is so small, the surface area of its cell membrane is very large compared with the small volume of its cytoplasm. The demands of the respiratory processes in the cytoplasm can therefore be met by the diffusion of oxygen and carbon dioxide between the cytoplasm and the surrounding water. Oxygen diffuses in and carbon dioxide diffuses out. © D.G. Mackean oxygen carbon dioxide maximum distance for diffusion is about 0.1mm...
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.

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