what is the coelem of the earthworm?\nwhat is the function of a ventral nerve cord?\nWhat is the largest digestive organs \n\nAny help! Please! Thanks
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the coelem is the type of body cavity they have, which is psuedocoelem, meaning fake. they have two types of cells, mesoderm and one other. they face eachother and form a cavity between them this is where they have organs, the ventral nerve cord runs down the back of the worm from its tiny brain to the end, this allows it to control its movements and sense pressure or pain. the digestive organs are the mouth, gizzard, pharynx, and intestine, there may be more
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This goes right back to a basic body plan for most animals going throughout evolution.  (A lot of this I got from Richard Dawkins, Ancestor's Tale.)\n\nThe basic body plan for most animals is a tube, with one end for feeding, and the other for excreting.  It then becomes useful to have all the senses at the feeding end, as the senses are helpful for finding food (and not needed at all for excreting).\n\nAnd then, as the nervous system gets more sophisticated, it becomes convenient to have the ganglia, and later the brain, near the main sensory organs.  This reduces the length of vital nerves from the sensory organs to the brain.  (E.g., if your brain was in the most protected part of your body, your abdomen, then think of how long the optic nerves would have to be from your eyes.  Not only does this cause a delay in signal transmission, but it increases the odds of damage to the optic nerve.) \n\nFast forward a couple of billion years, and this tube body plan hasn't changed much.  Sensory organ snear the feeding end, and brain near the sensory organs.  Humans are no different, except that they stand upright.  \n\nBut even then, it is advantageous to have our sensory organs perched as high up as possible, and again, to have the brain as close to these sense organs as possible in order to shorten the distance that sensory impulses have to travel.
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How does an earthworm eat? Earthworms eat by pulling food into their mouth with their prostomium combined with the muscular pharynx which creates a very high suction (like a vacuum). The food is stored in the crop and then ground up into small digestible pieces in the gizzard. Earthworms need a gizzard because they do not have any teeth. The nutrients are absorbed into the body in the small intestine. \nEarthworms probably feed while they are moving. They are not picky eaters as they will eat all sorts of dead things such as decaying plant and animal matter. They consume a great deal of matter in a short period of time - they can produce their own weight in castings (worm dung) every 24 hours!
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Homologous parts is about comparing *two* species (or male and female from the same species).\n\nTherefore only #2 is an example of homologous parts (as it is a comparison between dogs and humans).\n#1, 3, and 4 are examples of vestigial organs (or more correctly, 'vestigial structures' ... as sometimes the thing is so useless that it can't be called an 'organ' ... like the python leg bones).\n\nBy the way, some people might question whether human ear muscles are truly vestigial, because they are operational in some people (I can wiggle my ears).  However even if they work, it's hard to find a *purpose* for them, as is needed in other species to move ears for better hearing.  Similarly, some people claim that the human appendix sometimes serves some function for fighting infection.  However, the tailbone has no apparent function ... it's just a throwback to our embryology and ancestry.
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The small intestine is a long, narrow, coiled tube extending from the stomach to the large intestine. This is the place where most digestion and absorption of food takes place. The small intestine of a human can be as long as six to eight meters long (20-26 feet), depending on age and size of being. So much length can be compacted into so little space because of the nature of the small intestine; it is coiled and takes up less space, while maintaining it's enormous surface area.\n\nThe large intestine is the posterior or end of the human intestine that consists of four regions the, the cecum, the colon, the rectum and the anal canal. The large intestine is wider but shorter than the small intestine. It measures approximately 1.5 meters (5 feet) in length and its primary function is to absorb water and electrolytes that have already passed unabsorbed through the small intestine.\n\nTogether - the intestines range in length anywhere from 25 - 31 feet.
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try some of these websites:\n\nwww.mcwdn.org/Animals/Flatworm.html\n\nwww.k12.hi.us/~kapunaha/student_projects/ reef_org/worms/flat_worms.htm\n\nen.wikipedia.org/wiki/Flatworm
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simple animals have this total regeneration ability, even more, if you cut an earth worm to several pieces, each can regenerate to a complete worm.\nthis is very typical of plants.\nmore advanced/complicated animals have a much smaller regenerative ability. something in the genes of the primitive earth worms is lost among the more advanced animals.
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Liver:The liver is the largest internal organ in the human body\nFunction:It plays a major role in metabolism and has a number of functions in the body including glycogen storage, plasma protein synthesis, and drug detoxification.\nIt also produces bile,\nGall bladder:A part of Digestive system\n\nSpleen:Lymphatic system\nFunction:The spleen is a ductless, vertebrate gland that is not necessary for life but is closely associated with the circulatory system, where it functions in the destruction of old red blood cells.\n\nPancreas:A part of Digestive system and Endocrine system.\n\nPericardium:The pericardium is a double-walled sac that contains the heart \n\nCardiac valve:circulatory system\n\npyloric valve:Digestive system\nAt the end of pyloric stomach is presnt a strong circular muscle band,called pyloric valve
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I was wondering what any of you out there thought happens when you die? happens that ur body becomes food for the worms and something rich for the soil but i can rember what it was, but plant a mango tree in a cementary and u will have the best mangos and god is just a imaginary friend for the adults.
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According to the slithery sites in our Digestive System category, we have about thirty feet of intestines in our body! The small intestine, where most of the digesting happens, is over twenty-two feet long! The inner surface of the small intestine is covered with millions of tiny finger-like extensions called villi. These villi absorb the nutrients from the food and pass them into the blood supply. The large intestine, or colon, is about six feet long. It reabsorbs water from the undigested food passed on from the small intestine. A meal usually stays in your stomach for around three hours, but can stay in your digestive system for up to three days.
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"The vermiform appendage—in which some recent medical writers have vainly endeavoured to find a utility—is the shrunken remainder of a large and normal intestine of a remote ancestor. This interpretation of it would stand even if it were found to have a certain use in the human body. Vestigial organs are sometimes pressed into a secondary use when their original function has been lost."\n\nGiven our current evolutionary knowledge of comparative anatomy and phylogenetics, many biological structures can be considered vestiges. In evolutionary discussions the human vermiform appendix is one of the most commonly cited, and most disputed, vestigial structures. Evolutionary vestiges are, technically, any diminished structure that previously had a greater physiological significance in an ancestor than at present. Independently of evolutionary theory, a vestige can also be defined typologically as a reduced and rudimentary structure compared to the same homologous structure in other organisms, as one that lacks the complex functions usually found for that structure in other organisms\n\nThe appendix is longest in childhood and gradually shrinks throughout adult life. The wall of the appendix is composed of all layers typical of the intestine, but it is thickened and contains a concentration of lymphoid tissue. Similar to the tonsils, the lymphatic tissue in the appendix is typically in a constant state of chronic inflammation, and it is generally difficult to tell the difference between pathological disease and the "normal" condition. The internal diameter of the appendix, when open, has been compared to the size of a matchstick. The small opening to the appendix eventually closes in most people by middle age. A vermiform appendix is not unique to humans. It is found in all the hominoid apes, including humans, chimpanzees, gorillas, orangutans, and gibbons, and it exists to varying degrees in several species of New World and Old World monkeys
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omg- this is such a complex thing. i just took a parasite class and we talked about nothing but worms and amoebas. worms normally enter through digestion and then burrow their heads between villi. then it grows and matures and deposits eggs through feces. some worms use proglottids, some drop eggs directly into intestines. the eggs are then released out of the anus and ready for another host or vector. some worms end up going though the lamina propria in intestines and getting into hepatic duct and getting into the blood stream. worms can then get into the heart or even encyst in muscle and crippling the muscle if enough get in there. the trichino worm gets into arm muscles and enough render the arm useless.
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Locomotion.  The setae on each segment allow the earthworm to "grip" the earth while their longitutinal and circular muscles contract the rest of the body into place to apply forward pressure to "burrow" through the earth.
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What a cool project!  So to answer one of your questions, the crucial distinction among your phyla will be whether or not they're chordates -- which of course includes the vertebrates (but also some invertebrates such as sea squirts and certain worms).  \n\nSo your bipedal wolf (I'm assuming the missing d was a typo, but if "bipeal" is a word from your universe, please let me know) would be phylum chordata, class vertebrata, order mammalia, family canidae, genus canus, species lupus bipedalis (and I'm envisioning something like a cross between Lawrence Talbot and Speaker-to-Animals, without retractible claws).  But that's just off the top of my head.\n\nOne thing I've discussed with my ten-year-old son is the absence of hexapod vertebrates -- e.g. flying horses, winged dragons, etc.  If you were closer, I'd invite you over for coffee and an all-day discussion of where to classify them, and how they evolved.  Since all terrestrial vertebrates have essentially the same structure, it's clear they all shared a common ancestor which makes hexapodal vertebrates, sadly, impossible in our known universe -- so was there a hexapodal (imaginary) marine vertebrate who also scuttled across the floors of silent seas before crawling out of the surf and saying "Hey, the carcharodons can't get me here!  Kewl!"?  ...Which of course suggests all sorts of hexapodal marine vertebrates that shared the same skeletal architecture.  Ooooh, fun.\n\nAnd the final question... so zoology is the study of animals.  There's also cryptozoology, which I've described flippantly as "the study of imaginary animals."  But of course, it's more technically the study of animals that may or may not exist.  So what would we call your zoology, which is the study of animals you've intentionally invented?  Oh, of course, poeiazoology (-poeia, meaing to construct -- as in mythopoeia, the term Tolkien invented to describe the invention of mythologies.)\n\nAnd on that note, elen sila lumen omentielvo!
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This helped me when i took anatomy, if you can remember these 2 words SAME DAVE, divide them like this\n\nSA | ME\n------------\nDA | VE\n\nSA = sensory afferent\nME = motor efferent\nDA = dorsal\nVE = ventral\n\nIn the diagram drawn above with SAME DAVE, the DA is directly below SA, so you know that sensory afferent neurons are Dorsal, the VE is directly below the ME, so you know that motor efferent neurons are Ventral, if you have any questions, email me personally!
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Here is a great website for that sort of research. It has a taxonomic chart with hyperlinks to information, pictures, sounds, and specimens. There are more than a dozen phylums of 'worms' represented with many photos to help with identification. \n\nhttp://animaldiversity.ummz.umich.edu/site/accounts/classification/Animalia.html
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Read the information on these sites and maybe you will find some of the answers to your questions.\n\nhttp://www.answers.com/echinoderm%20\nhttp://www.answers.com/topic/tube-foot?hl=echinoderm\nhttp://www.answers.com/Aristotle%E2%80%99s%20Lantern\nhttp://www.answers.com/main/ntquery?method=4&dsid=2222&dekey=Sea+urchin&gwp=8&curtab=2222_1&linktext=sea%20urchins