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Shark Dissection

Shark Dissection. Each Dissection Group:. One member retrieves their shark Block 3: Hood Block 4: Cart One member retrieves a laptop computer Be sure to be working on questions while making cuts. Exterior Anatomy Checklist. Nares Spiracles Mouth Gill slits Cloaca Rostrum

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Shark Dissection

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  1. Shark Dissection

  2. Each Dissection Group: • One member retrieves their shark • Block 3: Hood • Block 4: Cart • One member retrieves a laptop computer • Be sure to be working on questions while making cuts

  3. Exterior Anatomy Checklist • Nares • Spiracles • Mouth • Gill slits • Cloaca • Rostrum • Dorsal spines • Dorsal fin • Caudal fin • Pelvic fin • Pectoral fin

  4. Part 1: Pre-Lab Questions • 1. How is the shark’s nose different from our own? • 2. Why are the Spiracles important? • 3. The mouth of the shark is part of which organ system(s)? • 4. What is the function of the Gill Slits? • 5. What does the Lateral Line do? • 6. What two organ systems include the cloaca? • 7. Since the Clasper is only present on male dogfish sharks, what gender is your shark? • 8. How many fins does a dogfish shark have? • 9. What’s another name for the Rostrum? • 10. Where are the Dorsal Spines located?

  5. 2A: Internal (Muscles) • Place shark in tray, ventral-side up. • Cut shallowly from opening to jaw line. • Remove skin from shark’s head • Expose muscles around head/jaw

  6. Part 2A Questions • 1. How did you position your shark to remove the Dorsal Spines? • 2. How did you position your shark once you remove the Dorsal Spines? • 3. In step 2 you made an incision from where to where? • 4. Was the shark’s skin as thick as you expected it to be? Why or why not?

  7. Internal Anatomy • Place shark in tray, ventral-side up. • Cut through muscular wall (gently) from cloaca to jaw • Make cuts across the shark to create flaps • Open shark up and pin it down to pad Be gentle so as not to damage internal organs!!

  8. Internal anatomy Checklist 2B • Esophagus • Stomach • Duodenum • Liver • Pancreas • Spleen • Rectum

  9. Part 2B Questions • Use your textbook and internet resources to describe the function of the following 7 organs: • Esophagus • Stomach • Duodenum • Liver • Pancreas • Spleen • Rectum • How does the ratio of digestive surface to shark size compare to the digestive surface to body size ratio in humans?

  10. Part 2C Internal Anatomy • Gentle cut up to sharks’ jaw and over to create flaps. • Pin flaps out of the way. • Cut behind gills … gently!!

  11. Part 2C Internal Anatomy Checklist • Heart • Gill rakers • Ventricle • Atrium • Teeth • pharynx

  12. Post-Dissection • Post-lab questions #1-23

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