take the leap - · pdf filetake the leap: carolina’s perfect ... compare frogs and...
TRANSCRIPT
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Take the Leap:Carolina’s Perfect Solution®
Frog Dissection
Carolina Biological Supply Company
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• 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
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• 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
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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
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Prepare to Dissect
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• Safety equipment
• Dissecting tray
• Dissecting kit
• Carolina’s Perfect Solution® specimen
Dissection Preparation
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Allow questions to guide the investigation.
Inquiry-Based Frog Dissection
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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?
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Vertebrates
Class Amphibia
Lack scales
Cold-bloodedBreed in water
What Do You Know About Frogs?
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Hair Smooth skin
Vertebrates
Mammals Amphibians
Produce milk
Bear live young
Metamorphosis
Egg-laying
Compare Frogs and Humans
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3 Differences from Humans
3 Similarities to Humans
1. 1.
2. 2.
3. 3.
Frog External Anatomy
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What physical features suggest adaptation to life in water?
External Survey: Guide the Inquiry
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What is the advantage?
Observe Coloration
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• How does the skin feel?
• What is its function?
• Is it good to be “slimy”?
External Survey: Guide the Inquiry
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• How do the eyes compare to our own?
• How many eyelids can you find?
• Location?
• Advantages?
External Survey: Guide the Inquiry
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Gender?
Note enlarged thumb pad
This is a male!
Suggest an advantage for this adaptation.
Account for Any Differences
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Cut through the jaw joints to take a closer look!
Examine the Oral Cavity
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Feature suggesting dietary adaptation to insects/small animals
Observe the Oral Cavity
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Glottis
Vomerine teeth
Maxillary teeth
Tongue
Gullet
Let’s “Probe” to Determine Structures!
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• Skin
• Nostrils
• Eyes
• Eardrums
• Upper extremities (arms)
• Lower extremities (legs)
• Mouth
Observation Checklist
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• 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
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• 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
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3 Differences from Humans
3 Similarities to Humans
1. 1.
2. 2.
3. 3.
Frog Internal Anatomy
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• Positions and structures
• Compare differences between frog and human.
Skeletal Structure
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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
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Love the Skin You’re In!
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Love the Skin You’re In!
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Lift the skin over the frog’s abdomen, insert a point of the scissors, and make the cuts as shown.
Internal Anatomy
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Cut through the thin muscle layer following the same pattern of cuts you made through the skin.
Internal Anatomy
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Liver
Stomach
Small intestine
Heart
Fat bodies
3
5
6
9
11
Internal Anatomy
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Liver
Gallbladder
Stomach
Small intestine
Large intestine
Spleen
Lungs
3
5
4
7
6
8
10
Internal Anatomy
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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
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Inquiry Option: System Jigsaw
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FrogHuman
Create a Venn Diagram
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We Can Meet Your Dissection Needs
Top-quality specimens and supplies
We Welcome the Opportunity to Exceed Your Expectations.
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Additional Resources from Carolina
Carolina™ BioLab® Virtual Lab Series
Guide students through an interactive virtual dissection, teaching internal and external features
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Carolina Free Resources
Carolina offers many free resources to help support
teachers.
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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
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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!
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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!