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Feeding on Small Particles
Microscopic algae and bacteria can be taken in directly into the cell by the digestive vacuoles. But one of the most successful methods of feeding on small particulate matter is filter feeding or suspension feeding. Particulate matter includes detritus, living and dead plankton. Most filter feeders use ciliated surfaces to produce currents - that draw drifting food particles into the mouth.
Figure: Sponges obtain their food by filtering seawater. Food particles pass down the collar cells or choanocytes and enter them through phagocytosis
The animal extracts the suspended food particles by means of structures that act as filters often aided by secretion of mucous which traps the food particles. In sponges, the flagella of the choanocytes, the cells that line the body cavity, create internal water currents. The body wall has numerous pores called ostia and the water is drawn in across the flagellated chamber into the body cavity. Food particles are trapped by the flagella and directed to the surface of choanocyte, which ingest the particles by phagocytosis.
Health Stroke Scale: Stroke is a leading cause of death, hospitalization, disability and health care expenditure in U.S. (Fonarow G. et al., 2012). Stroke is a medical condit
In a follow up to Alfred Sturtevant's studies on recombination in the fruit fly, Seymour Benzer used complementation studies of bacteriophage mutants to verify where recombination
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What is enzyme kinetics The study of the rate at which an enzyme works is called enzyme kinetics.
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excretory organ of lizard
In most axons, myelin sheath is interrupted at intervals of about 1 millimeter or more. These interruptions are known as: a) Collaterals b) Nodes of Ranvier (pron: ron-vee-ay)
A patient has a low red blood cell count, and microscopic examination reveals an abnormally high proportion of circulating reticulocytes. Upon subsequent examination, the patient i
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