Dissecting a Frog

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Dissecting a Frog
Lab Report #3
May 18, 2011

Purpose: The purpose of the lab was to dissect a frog to better understand the parts of it and their purposes.

Materials: dissecting scissors, a frog, a dissecting tray, a scalpel, and a probe

Procedure: The procedure began when the sides of the frog’s mouth were cut. Then, the frog’s internal and external structures were observed. Observations were recorded. After that, the liver, gallbladder, eggs, and fat bodies were removed.

Results: First, when the liver was dissected, it was noted that the liver was the largest structure in the body cavity. It had a brownish coloring to it and was composed of three parts: the right lobe, the left anterior lobe, and the left posterior lobe. It was not primarily used as an organ of digestion, but it secreted a digestive enzyme called bile. The bile was used to break down fats. Then, the esophagus, small intestines, spleen, large intestines, male reproductive organs, and fat bodies were located and observed. The esophagus was a tube that led from the frog’s mouth to the stomach. This dark-colored structure was used to move food toward the stomach by muscular constrictions and the beating of the cilia that lined its internal surface. The small intestines were sectioned in three parts. The first part was the duodenum; the second was the ilium, and the third was the jejunum. These parts were held together by a mesentery tissue and helped to digest materials that passed through it. The dark red, spherical spleen served as a holding area for blood. The wider large intestines, also known as the cloaca, were where everything such as waste, sperm, or urine passed through before these things left through the anus. The male reproductive organs, testes, were two beige colored organs on the kidneys. Last but not least, the fat bodies that were taken out were bright orange or yellow spaghetti-shaped structures that covered the organs and looked like little...
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