Shark Dissection.

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Presentation transcript:

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 Dorsal spines Dorsal fin Caudal fin Pelvic fin Pectoral fin

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?

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

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?

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!!

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

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?

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!!

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

Post-Dissection Post-lab questions #1-23