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Tapeworm: Difference between revisions
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==Anatomy== | ==Anatomy== | ||
The tapeworm is a long(6m or 20 ft.), soft-bodied, legless invertebrate with bilateral symmetry.[http://en.wikipedia.org/wiki/Tapeworm#Body_Systems] They are made up of a knoblike head or scolex(where most of the sensory organs are located-cephalization), a short, unsegmented neck following the scolex, and multiple flat, rectangular body segments or proglottids. On the external surface of the scolex there are hooks or suckers that allow the tapeworm to latch onto the inside of a host's intestines where it lives for most of its adult life.[http://www.factmonster.com/ce6/sci/A0861442.html] Adult tapeworms have no external cilia or flagellum. The worm's body covering consists of a thick tegument which protects it from the digestive jucies of its host.(Porch, p458) | The tapeworm is a long(6m or 20 ft.), soft-bodied, legless invertebrate with bilateral symmetry.[http://en.wikipedia.org/wiki/Tapeworm#Body_Systems] They are made up of a knoblike head or scolex(where most of the sensory organs are located-cephalization), a short, unsegmented neck following the scolex, and multiple flat, rectangular body segments or proglottids forms the [[strobila]]. On the external surface of the scolex there are hooks or suckers that allow the tapeworm to latch onto the inside of a host's intestines where it lives for most of its adult life.[http://www.factmonster.com/ce6/sci/A0861442.html] Adult tapeworms have no external cilia or flagellum. The worm's body covering consists of a thick tegument which protects it from the digestive jucies of its host.(Porch, p458) | ||
Almost all of the taeworm's metabolism is dedicated to reproduction; inside the scolex is a complete set of male and female reproductive organs. There are hardly any sensory organs in an adult tapeworme, the nerve center of a tapeworm is its scolex as well as a nerve cord running the length of the body even through the proglottids(they stop working upon detachment). They also have an excretory canal which is the only digestive system associated organ. The tapeworm has no organs for respiration and acheieves this on a celular level.[http://www.newworldencyclopedia.org/entry/Tapeworm] Each proglottid fertilizes and stores hundreds of eggs, the more mature proglottids are at the posterior end of the tapeworm. Proglottids that break off are called terminal proglottids.(Porch, p458) | Almost all of the taeworm's metabolism is dedicated to reproduction; inside the scolex is a complete set of male and female reproductive organs. There are hardly any sensory organs in an adult tapeworme, the nerve center of a tapeworm is its scolex as well as a nerve cord running the length of the body even through the proglottids(they stop working upon detachment). They also have an excretory canal which is the only digestive system associated organ. The tapeworm has no organs for respiration and acheieves this on a celular level.[http://www.newworldencyclopedia.org/entry/Tapeworm] Each proglottid fertilizes and stores hundreds of eggs, the more mature proglottids are at the posterior end of the tapeworm. Proglottids that break off are called terminal proglottids.(Porch, p458) | ||
==Reproduction== | ==Reproduction== | ||
A tapeworm's life cycle starts as an egg(once contained in a proglottid) that has been excreted in a host's feces. Once eaten by the intermediate host the egg travels to the intestine where it hatches. The newly hatched larvae(in most species it has a fully developed scolex) than burrows into and through the intestine wall into an organ or the body cavity. [http://animals.jrank.org/pages/1527/Tapeworms-Cestoda-BEHAVIOR-REPRODUCTION.html] The larvae stays in an organ(for example; the muscles, eyes, brain or almost any other organ of the body) of the intermideate .(Porch, p458) Once it is eaten by the intermedeate host it goes through the digestive system to the small intestine wherhost(which can be almost any vertebrate) untill it is consumed by the [[final host]], though some species have multiple [[intermedeate hosts]] the scolices of larvae attatch. After attatchment to the inside of the intestine the tapeworm starts producing proglottids and the strobila(the bulk of the tapeworm's body) forms. After more developement the proglotteds start producing eggs.[http://animals.jrank.org/pages/1527/Tapeworms-Cestoda-BEHAVIOR-REPRODUCTION.html] When fully matured a proglottid breaks off(a terminal proglotted) it is excreted in the host's feces.[http://www.factmonster.com/ce6/sci/A0861442.html] | A tapeworm's life cycle starts as an egg(once contained in a proglottid) that has been excreted in a host's feces. Once eaten by the intermediate host the egg travels to the intestine where it hatches. The newly hatched larvae(in most species it has a fully developed scolex) than burrows into and through the intestine wall into an organ or the body cavity. [http://animals.jrank.org/pages/1527/Tapeworms-Cestoda-BEHAVIOR-REPRODUCTION.html] The larvae stays in an organ(for example; the muscles, eyes, brain or almost any other organ of the body) of the intermideate .(Porch, p458) Once it is eaten by the intermedeate host it goes through the digestive system to the small intestine wherhost(which can be almost any vertebrate) untill it is consumed by the [[final host]], though some species have multiple [[intermedeate hosts]] the scolices of larvae attatch. After attatchment to the inside of the intestine the tapeworm starts producing proglottids and the [[strobila]](the bulk of the tapeworm's body) forms. After more developement the proglotteds start producing eggs.[http://animals.jrank.org/pages/1527/Tapeworms-Cestoda-BEHAVIOR-REPRODUCTION.html] When fully matured a proglottid breaks off(a terminal proglotted) it is excreted in the host's feces.[http://www.factmonster.com/ce6/sci/A0861442.html] | ||
Each proglottid contains one set of male reproductive organs and one set of female reproductive organs. In most species the male reproductive organs develope first, though there are some species in which the female reproductive organs develope first.[http://animals.jrank.org/pages/1527/Tapeworms-Cestoda-BEHAVIOR-REPRODUCTION.html] | Each proglottid contains one set of male reproductive organs and one set of female reproductive organs. In most species the male reproductive organs develope first, though there are some species in which the female reproductive organs develope first.[http://animals.jrank.org/pages/1527/Tapeworms-Cestoda-BEHAVIOR-REPRODUCTION.html] | ||
