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Hirudinea - Feeding and Digestion in Annelids
Hirudinea involves free living and ectoparasitic leeches. Leeches are blood suckers. The digestive system contains a preoral chamber which accommodates a sucker at the base of which lies the triradiate opening, the mouth. The walls of the mouth are embedded along with jaws, three in number, of which one is mid-dorsal and the other two ventro-lateral. Each jaw bears a row of minute teeth. The alimentary canal contains a thick muscular pharynx followed by a short oesophagus. Unicellular salivary glands are found on either side of the pharynx. The oesophagus is followed through a crop, an extensive sac consisting of 10 to 11 chambers, the chambers communicate along with each other by openings surrounded by sphincters. Each camber is gave with a pair of backwardly directed lateral caeca. There is a progressive increase in the size of caeca, the anterior pairs being smaller in size, and the caeca of last chamber being the largest. Following the crop, there is a small round stomach with a much folded inner wall, and the stomach in turn leads into a narrow intestine the inner wall of that is provided with horizontal and transverse folds to increase the absorptive surface. The intestine is followed by rectum that opens outside by anus.
Pseudorabies Pseudorabies is a viral disease caused by pseudorabies virus (PRV) that is classified under family Herpesviridae. This disease is also known as “Aujeszky’s diseas
Determine Factors affecting Zn Absorption - Micro Minerals? In the last unit you have studied that absorption of various minerals (bioavailability) is influenced by number of f
discuss the importance of protozoa to humans
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Simple Febrile Convulsions These are convulsions associated with fever and infection, and is commonest causes of seizures during infancy and early childhood. These convulsio
The entire mechanism of protein synthesis in eukaryotes is generally the same as in prokaryotes, with three phases explained as termination, elongation and initiation. Furthermore,
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Young's Trichromatic Theory According to Young's theory, three types of cones exist, each sensitive to a particular pigment-rythrolabe (red), chlorolabe (green), and cyanolabe
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