Frogs are animals that belong to the class Amphibia, commonly known as amphibians. Frog Dissection Guide Lesson Planet.A frog dissection is cheaper to conduct than larger animal and organ dissections.
Virtual frog dissection worksheet lab trial#
Start Your Free Trial Save time and discover engaging curriculum for your classroom. Subjects Science 1 more Resource Types Worksheets 1 more Audiences For Teacher Use 1 more Instructional Strategies Inquiry-Based Learning 2 more Technology Scientific Equipment WebQuest. Get Free Access for 10 Days! Curated and Reviewed by. Reviewed and rated by trusted, credentialed teachers. Save time and discover engaging curriculum for your classroom. It includes two links to virtual frog dissections the third link is brokenwhich should be accessed before the dissection, as the dissection instructions in the instructional activity are not detailed. Open the frogs mouth and find the esophagus, poke your probe into it and see where it leads.An outline guiding high school scientists through questions to think about during a frog dissection. The esophagus is the tube that leads from the frogs mouth to the stomach. Esophagus -Return to the stomach and follow it upward, where it gets smaller is the beginning of the esophagus. Spleen -Return to the folds of the mesentery, this dark red spherical object serves as a holding area for blood. The opening to the outside of the doy is the anus. The large intestine leads to the cloaca, which is the last stop before solid wastes, sperm, eggs, and urine exit the frog's body. Large Intestine -As you follow the small intestine down, it will widen into the large intestine.
Absorption of digested nutrients occurs in the small intestine. Note the blood vessels running through the mesentery, they will carry absorbed nutrients away from the intestine. The ileum is held together by a membrane called the mesentery. The first straight portion of the small intestine is called the duodenumthe curled portion is the ileum. Small Intestine -Leading from the stomach. It it a gland that often falls apart during the preserving process so it many not be visible on your frog. Pancreas - This structure is located on the inside curve of the stomach. The pyloric sphincter valve regulates the exit of digested food from the stomach to the small intestine. Follow the stomach to where it turns into the small intestine. The stomach is the first major site of chemical digestion. Stomach -Curving from underneath the liver is the stomach. This is the gall bladder, which stores bile. Gall Bladder -Lift the lobes of the liver, there will be a small green sac under the liver.
Lungs - Locate the two spongy lungs by looking behind the heart and liver. The large vessel extending out from the heart is the conus arteriosis. A single ventricle located at the bottom of the heart. The left and right atrium can be found at the top of the heart. Heart - at the top of the liver, the heart is a triangular structure. The live secretes a digestive juice called bile which is needed for the proper digestion of fats. The right lobethe left anterior lobeand the left posterior lobe. This brown colored organ is composed of three lobes. Liver -The largest structure of the the body cavity. Usually they are located just on the inside of the abdominal wall. Fat Bodies -Spaghetti shaped structures that have a bright orange or yellow color, if you have a particularly fat frog, these fat bodies may need to be removed to see the other structures. You may need to remove these eggs to view the organs. Life the flaps of the body wall and pin back. Make transverse horizontal cuts near the arms and legs.
Cut along the midline of the body to the forelimbs. Use scissors to lift the abdominal muscles away from the body cavity. Place the frog in the dissecting pan ventral side up.
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