Frog disection

Frog disection

Frog Dissection

Purpose: To use a frog to identify the external and internal organs of a preserved frog.

Hypothesis: I believe that there isn’t a big of a difference between frog organs and human organs.   They are smaller in size but they have the same shape and size.

Material and Methods: The materials used in this lab are a frog (preserved), scissors, dissecting pins (6-10), dissecting pan, stereomicroscope, dissecting probe, forceps microscope slides, coverslip, microscope, and a lab apron.

Procedure: First we took the frog out of the bag and rinsed it.   We looked at the external anatomy. We removed a 1cm * 1cm section of the dorsal skin containing one of the frog’s spots and looked at them through a microscope. Then we looked at the oral cavity. We took a peak at the two sets of teeth, esophagus, and the nose. Then we did the digestive system. We had to cut the frog to see all of the important organs. We looked at organs like the small intestine, pyloric sphincter, gallbladder, and pancreas. Then we looked at the respirator and circulatory system which included the lungs, heart, and spleen. They we looked at the excretory and reproduction systems which included the kidneys, bladder, ovaries, and fat bodies. Then we had to look at the brain.

Data and Observations: (See Attached Sheet)

Analysis: Looking at the skin under the microscope showed that human skin and frog skin are very different. Frogs have black small dots/lines, more in some places then others. Human skin doesn’t have those black dots that give pigment to make them more camouflage.

Conclusion: In this lab we used a frog to identify the external and internal organs of a preserved frog.   We also compared a frog’s organ to those of a human. I first thought that there wasn’t a big difference between frog and human organs. But after looking at the frog I don’t think there is much of a difference except for the brain and the skin.

Source of Error: One source of error...