earthworm dissection
DESCRIPTION
Earthworm Dissection. Phylum Annelida —segmented worms. Over 1000 species! (earthworms, marine worms, leeches). Segments allow for specialization of tissue and efficiency of movement. “Tube within a tube” digestive system Breath through skin by diffusion Closed circulatory system - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/1.jpg)
Earthworm Dissection
![Page 2: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/2.jpg)
•Phylum Annelida—segmented worms
•Over 1000 species! (earthworms, marine worms, leeches)•Segments allow for specialization of tissue and efficiency of movement
![Page 3: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/3.jpg)
• “Tube within a tube” digestive system
• Breath through skin by diffusion
• Closed circulatory system
• 2 kinds of muscle for movement: – Circular (shrink and spread)– Longitudinal (shorten and lengthen)
![Page 4: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/4.jpg)
Step 1-Locate the dorsal, ventral, anterior, and posterior sides
![Page 5: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/5.jpg)
Step 2-Find the sperm ducts and clitellum
![Page 6: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/6.jpg)
Step 3-Find the mouth and anus
![Page 7: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/7.jpg)
Step 4-Place 2 pins in the worm
![Page 8: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/8.jpg)
Step 5-Carefully cut the worm
Why do you think there is a thin, layer here?
![Page 9: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/9.jpg)
•Cut all the way to the clitellum
![Page 10: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/10.jpg)
Step 6-Pin the worm, exposing all internal organs
![Page 11: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/11.jpg)
Step 7-Identify all internal organs
![Page 12: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/12.jpg)
Pharynx—used to suck in food
![Page 13: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/13.jpg)
Esophagus—food travels through this after pharynx
![Page 14: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/14.jpg)
Seminal vesicles—produce sperm***Remove with tweezers
![Page 15: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/15.jpg)
*Crop-stores food*Gizzard-grinds up food (very strong)
crop gizzard
![Page 16: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/16.jpg)
Intestines!!!!!-digestion and absorption of food
![Page 17: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/17.jpg)
What are these small organs???
aortic arches/hearts
![Page 18: Earthworm Dissection](https://reader034.vdocuments.mx/reader034/viewer/2022050820/5681605b550346895dcf863d/html5/thumbnails/18.jpg)
This thin dark-red tube extends the entire length of the worm. It is the dorsal blood vessel !!!