Frog Dissection Pre-lab

Directions:

  • Label a piece of binder or scratch paper “Frog Dissection Pre-lab.”

  • Part I- read “Why dissect a frog?” & the "Dissection Safety Guidelines" below. Answer pre-lab questions 1-2.

  • Part II- Complete the two virtual dissections and pre-lab questions (3-8) below.

(If you brought headphones, you may use them!)

 

PART I

Why dissect a frog?

Frogs and humans are vertebrates with similar organ systems. Although all of the internal organs are not the same in frogs and humans, it is helpful to learn about anatomy through dissection. We will be looking at each body system, and exploring individual organs of the frog. We will make comparisons of the frogs’ anatomy to our own.

The frogs that we will use in our lab were bred in Mexico for the scientific purpose of learning anatomy. The companies that provide frogs make sure that the frogs are not an endangered species. The supply companies also use safe solutions to preserve the specimens. We still need to use gloves and wash our hands while working with preserved specimens.

The frogs gave their lives so that we can learn more about them and more about ourselves. In order to best use this opportunity to learn and show respect for the frog, we must follow all directions that are given to us and follow all safety procedures.

Dissection Safety Guidelines:

  1. Conduct yourself in a responsible and safe manner at all times during the dissection.

  2. Wear safety glasses while you are dissecting even if you wear glasses or contact lenses. Contact lenses can hold chemicals in the eye(s) increasing the potential damage in the event of an accidental splashing of chemicals into the eye(s).

  3. The frog has been preserved with a safe chemical and the classroom windows will be cracked open to allow fresh air in the room. However, if you need to take a break or the odor is beginning to bother you, notify the teacher.

  4. Avoid contact with preservative chemicals. Keep your hands covered with the plastic gloves at all times. Rinse the frog completely before dissection.

  5. Use the proper procedures described in the tutorial to pin the frog to the dissecting pan. Do not dissect the frog while holding it.

  6. Handle the scalpel with extreme care. It is sharp enough to cut through skin.

  7. Always cut away from your body and away from others.

  8. Never remove frogs/frog parts from the classroom. Properly dispose of dissected materials.

  9. Clean up the work area and return all equipment to the proper place when the dissection is completed.

  10. Wash off the plastic gloves with soapy water and place them in the designated area of the classroom.

 

1. What is the purpose of this lab? ___________________________________________

____________________________________________________________________________

 

2. What safety guidelines will be practiced when doing this lab? _________________

____________________________________________________________________________

 

PART II

Site 1 - Go to MHHE Virtual Frog Dissection and complete the module.
Site 2 - Go to Froguts Virtual frog and complete the dissection (click on View Demo at the bottom. You will need to click on it twice.)

To show that you have completed the virtual dissections, answer the following questions on binder or scratch paper. You will turn these questions in to your teacher.

3. Describe the steps of the procedure you would use to cut the frog to expose the organs to view. You may include drawings to explain the technique.

4. Describe the inside of the frog's mouth. What structures are visible and what are their functions? Include drawings.

5. Describe what you first see when you open the body cavity of the frog. What organs are obvious? Which organs may require a more thorough inspection?

6. Compare a male to a female frog. How can you tell the difference?

7. Choose one organ that you would find in the body cavity of the frog. Describe it in detail, explain what it does, where it is located and how you would find it in the frog.

8. Sketch the inside of the frog. Draw an arrow pointing to where the organ you chose is located in relation to the other organs in the frog. Label this diagram.

 

Part III- EXTRA CREDIT!

Complete the chart for extra credit:

Mrs. Arnold

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