Vomarine and Maxillary Teeth: Used for holding prey Internal Nares (nostrils) breathing Eustachian Tubes: equalize pressure in inner ear Glottis : Tube leading to the lungs Esophagus: Tube leading to the stomach Tongue: Front attached, aids in grabbing prey Tympanic Membrane: eardrum, located behind eyes Nictitating Membrane: clear eyelid, protects the eye This page is additional information that may be given to you in class as you perform the dissection. Periodically, your instructor may pause to show you illustrations, diagrams or videos of procedures. In the lab, you will be spending a few days, dissecting the frog. The largest organ in the body cavity: liverĪ. Organ found within the mesentery that stores blood: spleen 15. The large intestine leads to the: cloaca 14. Regulates the exit of partially digested food from the stomach: pyloric sphincter valve 13. A spiderweb like membrane that covers the organs: peritoneum 12. After food passes through the stomach it enters the: duodenum (sm intestine) 11. The first part of the small intestine(straight part): duodenum 10.
Yellowish structures that serve as an energy reserve: fat 9. The small intestine leads to the: large intestine 7. Eggs, sperm, urine and wastes all empty into this structure: cloaca 6. The organ that is the first major site of chemical digestion: stomach 5. Name the 3 lobes of the liver: right, left anterior, left posteriorĤ. The membrane holds the coils of the small intestine together: mesentery2.This organ is found under the liver, it stores bile: gall bladder 3. Key to Lab Handout Questions and Labelingġ. Finally, students get a lab test over the frog where frogs have been set up and tagged students move from station to station to identify the structures that have been pinned. I usually grade the questions and labelings from the Frog Dissection Handout and also give them a paricipation grade based on how well they did the lab, such as cutting the frog, cleaning up, and working well with others. Grading - the dissection can be difficult to grade. Scalpels, then be prepared to be very stern to ensure the safety of all of your students. It sounds harsh, but if you're willing to give a bunch of 15 year olds I typically end up removing a student from the class the first day, this student must do the alternate assignment in the hall. Address these issues before you start the lab and make clear that horseplay will not be tolerated. When you're helping one student, another may be throwing frog guts at their neighbors. Classroom Management - this can be a stressful time for teachers because students can get very excited and forget classroom rules. Students should wash hands even if they wore gloves. Latex gloves are preferred, but not entirely necessary. If this happens, use eyewash and liberally flush eye with water.
Safety Considerations - students must wear safety goggles, frogs will sometimes spray fluid when you cut them and this fluid can be painful if it enters the eyes. Younger students may need more help than older students. Remember that dissection is a learning process and part of the objectives should be to teach students to become independent learners. When students ask me questions, I require them to at least have a book open to the appropriate page to show me they tried to find the answer on their own.
STUDENT EXPLORATION FROG DISSECTION ANSWER KEY MANUALS
I have resources such as lab manuals and frog dissection guides laying around the lab. I also encourage my students to try to discover the answers to their questions before asking for help. Lab Resources - The frog dissection gallery is a good resource for teachers and students to review the parts of the frog. I also use virtual frogs before the dissection to give them a clue about the structures they will see inside. Usually the students decide who is going to read / write, and who is going to do the cutting. If I have extra frogs I might allow students to work alone (their choice). Group sizes - I usually put my students in groups of 2, possibly three if I have an odd number of students. The bullfrogs are messier and hard to cut, I have a "lottery" to pick a group to do the bullfrog and then the other students in the class can see what it looks like. Bullfrogs are much larger, but that doesn't mean they are easier to dissect. I have also gotten a single pack of bullfrogs to give one per class. It is not necessary for this lab to get the injected frogs. Obtain grass frogs from a biological supply company. Frog Dissection - Teacher's Guide Dissection Tips and Tricks
0 kommentar(er)
