About Frog Dissection Analysis
Frogs are an excellent choice for study of vertebrate animal anatomy. Frog dissection clearly shows the locations and relationships of the major organs and organ systems found in all vertebrate animals, including humans.
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Digestive System
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Frogs are predators, and feed mostly on insects. Frogs have the same digestive organs as humans. The alimentary canal, or "gut," consists of the esophagus, stomach, small intestine and large intestine. These are the organs that food passes through during the digestive process. Looking inside can provide insight into the frog's diet.
Cardiovascular System
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Human lungs take up much more space in the chest than do frog lungs. The cardiovascular system of frogs consists of a three-chambered heart and relatively small lungs. Much breathing is done right through the skin. Lacking a diaphragm and ribcage, frogs push air into their lungs using muscles in the floor of their mouths.
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Reproductive Systems
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The frog's reproductive embrace is called "amplexus." Fertilization is external in frogs; there are no copulatory organs. The gonads of both sexes are internal. Ovaries vary greatly in size, shape and texture depending on the state of egg development. Large, fat bodies, attached to the kidneys, also develop in reproductive females. Males also produce fat bodies, but these are much smaller, as are the male gonads. Oviducts lie along the dorsal body wall in both sexes, but are rudimentary in males.
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References
- Photo Credit frog image by pearlguy from Fotolia.com chinese woman holding an x-ray image by Allen Penton from Fotolia.com common frogs mating image by John Hartley from Fotolia.com
