THE YMCA ACADEMY
Name:
The Science Department
FROG DISSECTION LAB
Part 1: Pre-Lab Preparation
Date:
A. Visit the following virtual dissection sites:
http://mariemarie0000.free.fr/fichiers/images/frog.swf
http://dissect.froguts.com/
http://www.biologycorner.com/frog/review.html
B. Using the information learned on the sites practice recognizing some of the frog’s
internal organs. Be ready to comment on at least ONE of the eleven systems we have
been studying in class.
C. The system I will comment on is:
/1C
D. The facts I will share on the topic of the above system:
/3K,
/3C
Nicole Klement
SNC2PFall 2010
Page 1 of 4
Part 2 – The Lab
Purpose:
/1I
Hypothesis:
A frog will contain many organ systems similar to those of humans, but will also have
significant differences related to the way it lives.
Material:
1. Frog
2. Tray
3. Dissection tool kit
4. Paper towels
5. Gloves
6. Aprons
7. Group members with various tasks assigned (writer, doer, watcher)
Procedure:
Place the frog on its back.
Use the pins to hold back its arms and legs.
Use the scissors to cut open the frog.
Pull back the layer of muscle and tissue until the abdominal cavity is exposed.
Use the pins to hold back the muscle and tissue so that an unobstructed view of the
abdominal cavity is achieved.
6. Examine and identify the various internal organs.
7. Identify the organs as part of an organ system.
1.
2.
3.
4.
5.
Observations:
Describe at least two organ systems, identifying ALL the major organs.
/2K, /8I
System
1.
Description
2.
Nicole Klement
SNC2PFall 2010
Page 2 of 4
Conclusion:
Is there a similarity between humans and frogs? Are there differences?
/2K, /2I
Similarities
Differences
Questions:
1. What major part of the skeletal system is present in most animals, but absent in frogs?
/1K, /1I
2. Compare and contrast the size and musculature of the frog’s front legs and its back legs.
Explain the difference with regards to the purpose of the limbs.
/1K, /1I
3. What is the largest organ in the abdominal cavity? Why might this be?
/2K, /2I
Why?
4. What did you find inside the frog's stomach?
/1K, /1I
Nicole Klement
SNC2PFall 2010
Page 3 of 4
Frog Dissection Marking Scheme
Category: Knowledge and Understanding, use appropriate terminology related to digestion
BI2.01
Criteria: Level 1, (50-59%). Demonstrates limited understanding of terminology.
Criteria: Level 2, (60-69%). Demonstrates some understanding of terminology.
Criteria: Level 3, (70-79%). Demonstrates considerable understanding of terminology.
Criteria: Level 4, (80-100%). Demonstrates thorough understanding of terminology.
Category: Thinking and Investigation, conduct inquiries involving locating and describing
the interrelationship between digestive organs in a frog. SI1.05, BI2.05
Criteria: Level 1, (50-59%). Conducts inquiries with limited effectiveness.
Criteria: Level 2, (60-69%). Conducts inquiries with some effectiveness.
Criteria: Level 3, (70-79%). Conducts inquiries with considerable effectiveness.
Criteria: Level 4, (80-100%). Conducts inquiries with a high degree of effectiveness.
Category: Communication, expression and organization of ideas and information (e.g., clear
expression, logical organization). SI1.11
Criteria: Level 1, (50-59%). Expresses and organizes ideas and information with limited
effectiveness.
Criteria: Level 2, (60-69%). Expresses and organizes ideas and information with some
effectiveness.
Criteria: Level 3, (70-79%). Expresses and organizes ideas and information with considerable
effectiveness.
Criteria: Level 4, (80-100%). Expresses and organizes ideas and information with a high
degree of effectiveness.
Note: A student whose achievement is below Level 1 (50%) has not met the expectations for
this assignment or activity.
Nicole Klement
SNC2PFall 2010
Page 4 of 4