what is the purpose of a frog disection?
471331
To learn a little about anatomy, and to show furure medical students that the organs, veins, arteries, etc. looks entire different than those on neatly labeled, multi-colored, anatomy charts we see in biology books.
212560
First, do you know what a dichotomous key looks like? \nIt's a list of characteristics that are grouped (usually) in pairs of attributes that are exclusive of each other. \nDichotomous keys are used for taxonomic determination (that is, assigning an specimen to a taxon where it belongs), and you're supposed to start with the first characteristic, choosing one of the alternatives that corresponds to the specimen, and navigating to the next set of characteristics indicated by the key.\nIf you have a set of animals, the best way to start is writing down characteristics of each other, both the ones that they have in common and the ones that are exclusive. Then you can construct the Key starting at the characteristic that is most inclusive and allows you to separate large groups (or alternatively, separate one exclusive group from all the others... this depends on your choice). Then find a characteristic to separate the members of each group in smaller sub-groups, and so on until your key has a terminal alternative for each specimen.\nFor instance: your first dichotomy could be (I'm not saying it's the best one, just setting an exammple): \n1a. Homeotherms (warm-blooded) ....... 2\n1b. Poikilotherms ("cold-blooded").....3\n2a. With teeth.......mammals\n2b. Without teeth .... birds\netc.\n\nOr you could start with: \n1a. Without teeth...... 2\n1.b With teeth.....3\n2a. Cold blooded... turtles\n2b. Warm-blooded.... birds\netc.\n\nGood luck :-)
527741
Not sure why this is in engineering, but I assume you mean animal tissue culturing.  It is used a great deal in research, for modeling whole organs or whole animals in tests. It is used for production of antibodies either for research or for antivenom. Also used for detection of viruses (since viruses can only live in a host).  Those are just a few of the major uses.\nIf you are not asking about scope in terms of breadth of area used, but instead microscope, then generally we use a 10X dissecting scope to establish cultures, and a 20X to 40X visible inverted scope for examination of the culture.  There are endless number of microscope types used in tissue culture work, from electron MS, to confocol, 2-photon, etc etc.
578858
Question is a little vague......anatomy is structural and function is physiological, so I am not sure what your question really is; is it about anatomy or physiology or both? So RSVP:  Are you asking about the unique physiology or anatomy of amphibians?\n\nThey have many structures in common with the other tetrapod vertebrates, but also have unique structures as amphibians.  Plus each sub-class-type of amphibian (frogs-toads) vs (newts-salamanders) vs caecilians are each different.\n\nAll amphibians have their unique slimey scaleless skin through which they attain most of their oxygen and release their CO2 by diffusion, their 3-chambered heart with 2 atria and 1 ventricle, their external fertilization type reproductive system that has egg-larva-tadpole and adult.  Their respiratory system changes at each stage of development. As tadpoles they use their gills. As they metamorphose to adults,the gills are absorbed and lungs develop to breathe air although they lack a diaphragm and ribs (in most...some amphibians retain larval stage for their whole life...axolotyl). They have kidneys and bladder for excretory system; endoskeleton is bone and has most of the same bones as us, although some are fused (radio-ulna, fibulo-tibia; no skull protecting brain, unusual urostyle bone of pelvis.
61916
The only thing I've used it for is to assess whether a target gene was successfully uptaken and expressed in gene transfection, by using a gene that had the GFP gene attached to it.\n\nWikipedia also mentions it being used in the production of biosensors and it is put next to genes in developing organisms to see where and when genes are being expressed.
794330
hey i am not sure whether this is the right answer....but it was worth a try....\n\n \nRana pipiens, also known as the northern leopard frog, is a very important frog in the ecosystem. The northern leopard frog is a key animal in the food web. Frogs are more important to human survival and our current way of life than you may think! Frogs are so important that ecologists consider them to be bioindicators. In other words, scientists consider the health of a frog population to be a reflection of the health of the entire ecosystem (Encarta, 2001).\n\nDistribution\nThe northern leopard frog, R. pipiens, is common in North America, inhabiting twenty-six states and much of Canada (see adjacent map).\n\nHabitat\nRana pipiens live in a wide range of habitat, from open water and marshes to deserts and mountains (Frogs.org, 2000-2001).\n\nPhysical Characteristics\nThe northern leopard frog is medium in size, averaging from two to five inches long. They are green, brown, or both and have large dark irregular spots covering the dorsal part of their body (NPWRC, 2001). The skin covering R. pipiens is moist and smooth, and contains glands that secrete mucus in order to keep the skin from drying out. Northern leopard frogs also have glands in their skin that secrete poisons, which are strong enough to help them escape from their predators but are not harmful to humans (Encarta, 2001). Rana pipiens have eyes that are very keen, helping them not only capture prey but also to identify danger in their surroundings (Encarta, 2001). The northern leopard frog also has very powerful hind legs which are the main source of power in swimming and jumping. Also useful in swimming are the frog's webbed hind feet (Frog, 2001).\n\nFood and Feeding\nThe diets of tadpoles and froglets differ from those of adult R. pipiens, with the young consuming herbivory such as algae as well as microscopic animals. Adults feed largely on insects, but also slugs, snails, and smaller vertebrates such as chorus frogs (Harding 156-157 and Donegan, 1996).\n\nRelationship to other organisms in the ecosystem\nRana pipiens are common prey of birds such as herons, reptiles such as snakes, and mammals (including humans) (Donegan, 1996). Rana pipiens play an important role to humans. Besides being a source of food, frogs are used at every stage in their life for scientific study (Donegan, 1996). Furthermore, frogs play a key role in integrative pest management, eating agriculturally destructive insects.\n\nReproduction\nCopulation occurs in the water between March and June. The females release eggs while swimming and the male, who attaches himself to the female with specialized thumbs, fertilizes the eggs. The fertilized eggs are then attached to either underwater plant material or simply placed on the bottom of the pond (Frogs.org, 2001). Each female lays up to 3,000 eggs, which hatch 10-20 days after fertilization (Rasmussen, 2001).\n\nDevelopment and Lifespan\nThe frog life cycle (shown to the left) is fairly simple. The frogs begin their lives as eggs, which are laid in clumps. When the eggs hatch the baby frogs are tadpoles and do not have limbs or lungs, like the adult frog. The tadpole undergoes metamorphosis, growing hind legs first, then front legs, and at the same time, developing a well defined head. The gills are replaced with lungs as the froglet adapts to life on land. On land the frog continues to lose its tail and grow in size. Rana pipiens reach sexual maturity in two or three years (Encarta, 2001).\n\nBehavior\nRana pipiens are mostly nocturnal. Rana pipiens travel far distances away from water, but they must return to breed. In order to escape predators the northern leopard frog leaps into the water and buries itself in the mud or, if on land, takes several jumps into the air and then dives under vegetation for cover (Harding, 157). During the winter months northern leopard frogs hibernate.\n\nCommunication\nThe male northern leopard frog uses his croak to att
46269
Electrical Tests on Dead Frogs:\n\nhttp://campus.murraystate.edu/tsm/tsm118/Appendix/galvani.htm\n\nhttp://www.worldwideschool.org/library/books/sci/chemistry/ContactElectrificationAndTheElectricalCurrent/chap1.html\n\nhttp://galileo.phys.virginia.edu/classes/109N/more_stuff/E&M_Hist.html\n\nhttp://chem.ch.huji.ac.il/~eugeniik/history/volta.htm
1109778
cause the frog is too lazy to actually move and get food with its hands. so it uses its slimy toungue
413968
http://dev.biologists.org/cgi/content/full/130/17/4123?ck=nck
720901
http://www.tooter4kids.com/Frogs/life_cycle_of_frogs.htm
1065641
During electrophorsesis or the electrical separation of protein substances you need a single point of entry into the gel so that the protein or material to be separated can effectively be manipulated by the electrical field created in the gel medium.  The substances then separate themselves by way of electrical charge on the molecule, pH of the gel used, and the strength of the electrical current passed through the gel.  You want the separation to occur in a controlled manner so you can later stain the gel medium with a protein or suitable dye and visualize the different substances separated into unique patterns so they can be identified against a known sample of substance.  A machine called a densitometer can scan the gel medium and calculate the % of each population of substances stained in the gel.
103190
nzflamingo, make sure to add the "http://" part to your links to be functional.\nSome more sites:\nhttp://curry.edschool.virginia.edu/go/frog/\nhttp://sps.k12.ar.us/massengale/frog_dissection.htm
455801
Frogs have a three-chambered heart, consisting of two atria and a single ventricle. Blood leaving the ventricle passes into a forked aorta, where the blood has an equal opportunity to travel through a circuit of vessels leading to the lungs or a circuit leading to the other organs. Blood returning to the heart from the lungs passes into one atrium, while blood returning from the rest of the body passes into the other. Both atria empty into the single ventricle. While this makes sure that some blood always passes to the lungs and then back to the heart, the mixing of oxygenated and deoxygenated blood in the single ventricle means the organs are not getting blood saturated with oxygen. Still, for a cold-blooded creature like the frog, the system works well.
131653
Toads do not have external genitalia, so unless you are planning to dissect it or analyze its tissues, you may:\n\n- observe any external dimorphic characteristics: \n..males of many species are larger (however, in many other species the females are larger), may have some coloration differences, or other special structures (not common);\n..they may have pectoral patches or rugose areas on their hands, especially during the breeding period; \n..they may have bigger tympanic membranes than the females;\n\n- test their behavioral response:\n.. if you grab a male toad by its dorsum, using your thumb and index finger to squeeze its sides (gently!), it will probably start vibrating and maybe making soft vocalizations. This is the way that males have of telling other males "Hey, I'm not a girl" to avoid being grabbed during amplexus (the reproductive 'embrace'). However, in some cases, females that have no more eggs to liberate may also emit this disruptive vibration. \n\nOf course, once you dissect it it becomes easier. But I don't like the idea. As Gandalf once said "He that breaks a thing to find out what it is has left the path of wisdom".
241145
Frogs do not have anything that is watertight. Their skin is so porous that water will enter their butts rapidly through osmosis.
759955
Maybe.\n\nSerum protein electrophoresis generally separates the proteins into five distinct bands.  For such different creatures, I would expect the population of the various bands to be fairly different, and therefore it would be a good tool to distinguish between those different species, I suppose.\n\nIf, on the other hand, you wanted to compare SPECIFIC proteins in these different creatures, electrophoresis would probably be a poor way to get a good sample.  I'm thinking the right kind of chromatograph or a targetted binding reaction would be better for that.
1038040
It's called the Mantella frog. Much smaller than the Tomato frog but still are toxic. No specific pressures have been identified, since their competition is limited and they have begun to encroach into human civilization for feeding. The deforestation may shrink their jungle environment, but they are rather flexible in their habitats.\n\nThey are native to Northern Madagascar.