Take the Leap:Carolina’s Perfect Solution®

Frog Dissection

Carolina Biological Supply Company

• Perform an inquiry-based frog dissection focusing on structure and function

• Compare frog and human anatomy

• Learn to locate and identify major organs of the respiratory, cardiovascular, and digestive systems

• Experience the quality of Carolina’s Perfect Solution®

Objectives

• 15 Carolina’s Perfect Solution® double-injected frogs

• 15 disposable dissecting trays

• 15 plastic storage bags

• Teacher’s manual including Bioreview® Sheets and reproducible student guide

Advanced Frog Dissection BioKit®

Catalog no. 221470

Personal protective equipment• Gloves, goggles, and lab aprons

Sharps• Use sharp instruments sparingly; explore

with blunt instruments

Safety tip• Set down unused instruments

Safety Issues

Prepare to Dissect

• Safety equipment

• Dissecting tray

• Dissecting kit

• Carolina’s Perfect Solution® specimen

Dissection Preparation

Allow questions to guide the investigation.

Inquiry-Based Frog Dissection

National Science Education Standards

“Students at all grade levels and in every domain of science should have the opportunity to use scientific inquiry and develop the ability to think and act in ways associated with inquiry, including using appropriate tools and techniques to gather data.”

Why the Inquiry Method?

Vertebrates

Class Amphibia

Lack scales

Cold-bloodedBreed in water

What Do You Know About Frogs?

Hair Smooth skin

Vertebrates

Mammals Amphibians

Produce milk

Bear live young

Metamorphosis

Egg-laying

Compare Frogs and Humans

3 Differences from Humans

3 Similarities to Humans

1. 1.

2. 2.

3. 3.

Frog External Anatomy

What physical features suggest adaptation to life in water?

External Survey: Guide the Inquiry

What is the advantage?

Observe Coloration

• How does the skin feel?

• What is its function?

• Is it good to be “slimy”?

External Survey: Guide the Inquiry

• How do the eyes compare to our own?

• How many eyelids can you find?

• Location?

• Advantages?

External Survey: Guide the Inquiry

Gender?

Note enlarged thumb pad

This is a male!

Suggest an advantage for this adaptation.

Account for Any Differences

Cut through the jaw joints to take a closer look!

Examine the Oral Cavity

Feature suggesting dietary adaptation to insects/small animals

Observe the Oral Cavity

Glottis

Vomerine teeth

Maxillary teeth

Tongue

Gullet

Let’s “Probe” to Determine Structures!

• Skin

• Nostrils

• Eyes

• Eardrums

• Upper extremities (arms)

• Lower extremities (legs)

• Mouth

Observation Checklist

• Frog skin vs. human skin: name the differences.

• Frog upper extremity vs. human arm: name differences and similarities.

• Frog lower extremity vs. human leg: locate frog’s hip, thigh, knee, calf, ankle, and foot. Name differences and similarities between frog foot and human foot.

Discussion Questions

• How do humans breathe?

• How is a frog able to pump air in and out of its lungs?

• What roles do the ribs and diaphragm play in breathing?

Discussion Questions

3 Differences from Humans

3 Similarities to Humans

1. 1.

2. 2.

3. 3.

Frog Internal Anatomy

• Positions and structures

• Compare differences between frog and human.

Skeletal Structure

Allow students to:

1. Ask any 3 questions about the frog.

2. Ask 3 questions about the frog that can be answered by dissection.

Open Inquiry

Love the Skin You’re In!

Love the Skin You’re In!

Lift the skin over the frog’s abdomen, insert a point of the scissors, and make the cuts as shown.

Internal Anatomy

Cut through the thin muscle layer following the same pattern of cuts you made through the skin.

Internal Anatomy

Liver

Stomach

Small intestine

Heart

Fat bodies

3

5

6

9

11

Internal Anatomy

Liver

Gallbladder

Stomach

Small intestine

Large intestine

Spleen

Lungs

3

5

4

7

6

8

10

Internal Anatomy

1. Organs vs. systems: what is the relationship?

2. Similarities and differences between frog and human organs.

3. Compare frog heart to human heart. Differences?

4. Answer questions posed prior to dissection.

Guide the Inquiry

Inquiry Option: System Jigsaw

FrogHuman

Create a Venn Diagram

We Can Meet Your Dissection Needs

Top-quality specimens and supplies

We Welcome the Opportunity to Exceed Your Expectations.

Additional Resources from Carolina

Carolina™ BioLab® Virtual Lab Series

Guide students through an interactive virtual dissection, teaching internal and external features

Carolina Free Resources

Carolina offers many free resources to help support

teachers.

Time to Clean Up . . .

Carolina’s Perfect Solution® specimens• Return to white bucket or take home

for further study

• All other waste in the trash bags

Dissecting pans and instruments• Clean or take as gift

Safety glasses and aprons• Gift from Carolina

Evaluation forms/info cards• Complete, return to presenter

Evaluations: Share Your Thoughts!

Scale = 1 to 10

10 = Outstanding

9 = Above Average

8, 7 = Average

6, 5, 4 = Below Average

3, 2, 1 = Well Below Average

Please provide comments!

Carolina Biological Supply Company

Thank you for investing your time in our training program.

For all of your classroom needs, check out our Web site, www.carolina.com.

Enjoy the rest of the conference!