Name_____________________________________Date______Period____
Due Friday, March 9, 2007
Apparatuses
(1)
(1)
27-inch double-injected Dogfish Shark
Dissection kit:
Scissors
Blunt Probe
Needle-nose probe
Forceps
Scalpel
Dissection tray
Computer
Pen
Gloves
References
Procedure
1.
2.
Gather all materials.
Make an incision to the left of the stomach from the left side of the cloaca to the
pectoral girdle.
3.
Make vertical cuts from the anterior and posterior of the longitudinal incisions.
4. Pin cut sections down.
5. Observe and make comparisons of dogfish and human digestive systems.
a. Remove skin from the stomach from the head between the mouth and
pectoral girdle.
6. Expose the pectoral girdle by removing some of the overlying muscle tissue and
continue the mid-stomach incision from the abdomen through the center of the
pectoral girdle.
7. Cut through the membrane under the pectoral girdle until the heart is exposed.
8. Observe and make comparisons of dogfish and human circulatory systems.
9. Insert one blade of scissors into the left corner of the mouth and cut the body wall
along the line that runs posterior under the gill slits as far as the pectoral girdle.
10. To expose a gill completely, cut along the back and the stomach from the ends of
two adjacent gill slits.
11. Make observations and comparisons between the dogfish shark and human
respiratory systems.
12. Make a slit through the peritoneum about one and one-half inches in length along
the side border of either kidney and strip it toward the midline to make accessible
for study.
13. Make observations and comparisons between the dogfish shark and human
urogenital systems.
Results
What are the differences and similarities of a dogfish shark and humans?
Figure 1
Dogfish Shark
Human
Digestive System
Circulatory System
Urogenital System
Respiratory System
Analysis/ Conclusion
Show the similarities and differences of the digestive, urogenital, circulatory and
respiration systems of the dogfish shark and humans.
Please write a conclusion about your findings of the shark and human anatomy.
Use the table in the results section.