Download Frog Dissection 2014

Frog Dissection Guidelines
http://www.kidzworld.com/site/p3138.htm
INSTRUCTIONS FOR DISSECTION:
THIS IS THE ONLY SPECIMEN YOU AND YOUR PARTNERS WILL GET.
DO NOT MUTILIATE YOUR SPECIMEN, AS IT WILL SERVE AS A STUDY
GUIDE!
•REMEMBER: Dissection is not just cutting and slicing. Except
for major incisions, such as removing layers of skin and muscle
to open the body cavity, dissection is NOT cutting. Rather, it is
making careful incisions to expose organs and then using a
probe to separate various structures. The intent is to carefully
unwrap the organism’s structures without damaging them.
•Make sure you keep your specimen moist when it is not in use.
If you let it dry out, it gets foul and nasty, grows fungus,
becomes a biohazard and is no longer good for studying. Wrap
it in damp paper towels and store it in the plastic bag provided.
•Complete the packet/chart. Anything in the packet is fair game
for the test. You will be given a lab practical test over the
dissection portion of the unit. This will not only cover the
written material from the systems test but will also include the
dissection unit.
Dissection Directions
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Observe the external features of the frog.
Use the illustrations to locate all external features.
Determine if the frog is male or female
Place frog so that its ventral (abdomen) surface is facing
up.
Use scissors to make small incisions in the corners of
the mouth, where the upper and lower jaws are joined at
a hinge joint.
Pry the mouth open as wide as possible and locate the
structures indicated by your teacher. Use the pictures
and illustrations as guides.
http://www.aa.psu.edu/biology/frog/default.htm
http://www.biologycorner.com/worksheets/frog_external.html
Websites to view dissected frogs
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http://www.biologycorner.com/myimages/frog-dissection/ (dissection images)
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http://www.cumberland.k12.il.us/schools/chs/starwalt%20projects/Frog%20Disse
ction/frog_dissection.htm (dissection images)
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http://www.backyardnature.net/frogsex.htm (frog reproduction)
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http://dj003.k12.sd.us/science%20labs/dissection/frog%20dissection.htm
(dissection guide with online test that includes images)
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Refer to pages 834-841 for Amphibians Overview
Directional Terms
Anterior (Cranial) - toward the head
Posterior (Caudal) - toward the tail
Lateral - toward the side
Dorsal (Superior) - toward the backbone
Ventral (Inferior) - toward the belly
Leopard Frog
Dissection: Day 1
Nictitating Membrane
http://www.ofsd.k12.wi.us/science/eyesears.htm
Tympanic Membrane
http://www.ofsd.k12.wi.us/science/eyesears.htm
Forelimb
http://www.ofsd.k12.wi.us/science/forelegs.htm
Thigh, Hind Limb, Web
http://www.ofsd.k12.wi.us/science/extfoot.htm
Frog Mouth Structures
http://www.hoala.org/marine%20biology/frog%20dissection.html
Mouth Structures
http://www.ofsd.k12.wi.us/science/vomerine.htm
Mouth Structures
http://www.ofsd.k12.wi.us/science/gullet.htm
CLEANING UP!
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Clean up your table by placing your frog into a plastic
bag given to you by your teacher.
Write all of your group members’ names on the plastic
bag. Take care of this bag! You will be using it for
several days.
PLACE THE BAG IN THE AREA PROVIDED FOR
YOUR CLASS BY YOUR TEACHER!
Wash your gloves with soap and water, and dry with
paper towels. Write your name on the gloves, and place
gloves in the designated area for reuse.
Spray your table with disinfectant and dry with paper
towels. Dispose of towels in trashcan.
Wash your hands with soap and water.
Leopard Frog
Dissection: Day 2
Heart and Liver
http://www.ofsd.k12.wi.us/science/cutmuscl.htm
Gall Bladder
http://www.ofsd.k12.wi.us/science/liver.htm
Stomach, Pancreas, Small Intestine
http://www.ofsd.k12.wi.us/science/stomach.htm
Spleen, Oviduct, Egg Mass
http://www.ofsd.k12.wi.us/science/oviducts.htm
Pancreas and Fat Bodies
http://www.ofsd.k12.wi.us/science/review.htm
Liver, Small Intestine, Fat Bodies
http://www.ofsd.k12.wi.us/science/cutmuscl.htm
Stomach and Pancreas
http://sps.k12.ar.us/massengale/frog_dissection.htm
Circulatory System Terminology
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Pericardium: surrounds & protects the heart
Thymus gland: aids in immunity & produces WBCs
Atria: 2 top chambers of the heart, receives the blood
Ventricles: 2 bottom chambers of the heart, pump blood
Septum: separates the right & left sides of the heart
Coronary blood vessels: feeds the muscle of the heart with
oxygen
Aorta: carries oxygenated blood to body
Anterior Vena Cava: carries blood from head to heart
(deoxygenated)
Posterior Vena Cava: carries blood from bottom to heart
(deoxygenated)
Look at the differences in an amphibian heart.
The amphibian heart has
only 3 chambers. This
allows for only 60% degree
of oxygenation of blood in
the ventricle.
CLEANING UP!
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




Clean up your table by placing your frog into a plastic
bag given to you by your teacher.
Write all of your group members’ names on the plastic
bag. Take care of this bag! You will be using it for
several days.
PLACE THE BAG IN THE AREA PROVIDED FOR
YOUR CLASS BY YOUR TEACHER!
Wash your gloves with soap and water, and dry with
paper towels. Write your name on the gloves, and place
gloves in the designated area for reuse.
Spray your table with disinfectant and dry with paper
towels. Dispose of towels in trashcan.
Wash your hands with soap and water.