Download Internal Dissection Day 2 Frog`s Name: Surgeon: Reader: Recorder

Internal Dissection
Day 2
It isn’t easy
being green.
Frog’s Name:
Surgeon:
Reader:
Recorder:
Quality Control Officer:
To start: Place the frog in the dissecting pan ventral side up and pin the sides as you did yesterday.
Locate the following organs below. Check the box to indicate that you have found them.
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Fat Bodies – Spaghetti shaped structures that have a bright orange or yellow color. They are
usually located on the inside of the abdominal wall.
Peritoneum – A spider web like membrane that covers many of the organs. You may have to
carefully pick it off to get a clear view.
Liver – The largest structure of the body cavity. This brown colored organ is composed of three
parts or lobes.
Heart – at the top of the liver, the heart is a triangular structure. The left and right atrium can
be found at the top of the heart. A single ventricle located at the bottom of the heart.
Lungs – Locate the lungs by look underneath and behind the heart and liver. They are two
spongy organs.
Gall Bladder – Lift the lobes of the liver. There will be a small green sac under the liver.
Stomach – Curving from underneath the liver is the stomach. Follow the stomach where it turn
into the small intestine.
Small Intestine – Leading form the stomach.
Large Intestine – As you follow the small intestine down, it will widen into the large intestine.
Spleen – Return to the folds of the mesentery, this dark red spherical object serves as a holding
are for blood.
Esophagus – Return to the stomach and follow it upward where it gets smaller is the beginning
of the esophagus. The esophagus is the tube leading from the frog’s mouth to the stomach.
If you have not located each of the organs above, do not continue on to the next section.
Removal of the Stomach:
1. Cut the stomach out of the frog and open it up. You may find what remains of a frog’s last meal
in there.
2. Empty the contents and weight them on the scale up front. What did you find?
How much do they weigh?
3. Look at the texture of the stomach inside.
Measuring the Small Intestine:
1.
2.
3.
4.
Remove the small intestine from the body cavity and carefully separate the mesentaery from it.
Stretch the small intestine out and measure it
Now measure your frog.
Record your measurements below.
a. Frog’s Length
cm
b. Intestine Length
cm
Dissecting the Rest of the Organs:
1. Remove the rest of the organs and place them in the correct box on the extra sheet provided.
2. Ask teacher to check of your work.
Teacher initial
Clean Up & Preparation for Frog Night:
1. Once you have completed the dissection of the other organs you will prepare to exhibit them for
Parent Frog Night.
2. Rip up 15 pieces of paper towel. Large enough to hold each frog organ.
3. Label each frog organ on each piece of paper towel with a PEN or MARKER.
4. Moisten the paper towel then wrap the appropriate frog organ in it.
5. Wrap the remaining frog body in another paper towel.
6. Place the frog organs in the plastic bag to be ready to show your parents tonight.
Post Lab Questions:
1. The small intestine leads to the
.
2. The esophagus leads to the
.
3. The yellowish structures that serves as an energy reserve are
.
4. The organ that is the first site of chemical digestion is
.
5. After food passes through the stomach it enters the
.
6. The large intestine leads to the
.
7. The organ found within the mesentery that stores blood is
8. The largest organ in the body cavity is
9. The organ that is found under the live and stores bile is
10. Eggs, sperm, urine, and wastes all empty into this structure:
.
.
.