Carolina Biological Supply Company
Take the Leap:
Carolina’s Perfect Solution®
Frog Dissection
Objectives
•
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®
Advanced Frog Dissection BioKit®
Catalog no. 221470
•
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
Safety Issues
Personal protective equipment
• Gloves, goggles, and lab aprons
Sharps
• Use sharp instruments sparingly; explore
with blunt instruments
Safety tip
• Set down unused instruments
Prepare to Dissect
Dissection Preparation
• Safety equipment
• Dissecting tray
• Dissecting kit
• Carolina’s Perfect
Solution® specimen
Inquiry-Based Frog Dissection
Allow questions to guide
the investigation.
Why the Inquiry Method?
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.”
What Do You Know About Frogs?
Breed in water
Cold-blooded
Class Amphibia
Lack scales
Vertebrates
Compare Frogs and Humans
Vertebrates
Mammals
Amphibians
Hair
Smooth skin
Bear live young
Egg-laying
Produce milk
Metamorphosis
Frog External Anatomy
3 Differences from
Humans
3 Similarities to
Humans
1.
1.
2.
2.
3.
3.
External Survey: Guide the Inquiry
What physical features suggest adaptation to life in water?
Observe Coloration
What is the advantage?
External Survey: Guide the Inquiry
•
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?
•
Location?
•
How many eyelids can
you find?
•
Advantages?
Account for Any Differences
Gender?
Note enlarged
thumb pad
This is a male!
Suggest an advantage for this adaptation.
Examine the Oral Cavity
Cut through the jaw
joints to take a closer
look!
Observe the Oral Cavity
Feature suggesting dietary
adaptation to insects/small animals
Let’s “Probe” to Determine Structures!
Maxillary teeth
Vomerine teeth
Gullet
Glottis
Tongue
Observation Checklist
•
Skin
•
Nostrils
•
Eyes
•
Eardrums
•
Upper extremities (arms)
•
Lower extremities (legs)
•
Mouth
Discussion Questions
•
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?
Frog Internal Anatomy
3 Differences from
Humans
3 Similarities to
Humans
1.
1.
2.
2.
3.
3.
Skeletal Structure
•
Positions and
structures
•
Compare differences
between frog and
human.
Open Inquiry
Allow students to:
1. Ask any 3 questions about the frog.
2. Ask 3 questions about the frog that can be
answered by dissection.
Love the Skin You’re In!
Love the Skin You’re In!
Internal Anatomy
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
3
Liver
5
Stomach
6
Small intestine
9
Heart
11
Fat bodies
Internal Anatomy
3 Liver
4 Gallbladder
5 Stomach
6 Small intestine
7 Large intestine
8 Spleen
10 Lungs
Guide the Inquiry
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.
Inquiry Option: System Jigsaw
Create a Venn Diagram
Human
Frog
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!