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Understanding Annelids: Characteristics and Internal Anatomy

Explore the fascinating world of Annelids, segmented organisms with no respiratory organs and a closed circulatory system. Learn about their digestive, circulatory, and respiratory systems, as well as the internal anatomy of an Earthworm. Delve into their unique features and functions to deepen your knowledge of these creatures.

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Understanding Annelids: Characteristics and Internal Anatomy

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  1. Phylum Annellida Phylum AnnellidaClassification • Contain circular rounded long body (bilaterally symmetrical) • Segmented • Has no respiratory organs • Has a closed circulatory system

  2. Digestive System • Annelids Digestive system is basic • Contains a mouth which swallows food • Goes through crop and gizzard • Then the intestines that lead to the anus

  3. Circulation System • Blood carried through annilids contain hemoglobin • It’s a closed circulation which means its in well developed blood vessels • Has 5 hearts/Aordic Arches

  4. Respiratory System • Annelids do not contain lungs or organs to help them breath • Breath through their skin • Lets out carbon dioxide through skin • Oxygen can be transported to blood

  5. Dissection : Earthworm • Have your worm look like this

  6. Dissection : Earthworm External Mouth: Eats food Setae: Helps the worm move through the ground Sperm Duct: Where sperms are released Clitellum: where eggs are held and released for reproduction

  7. Dissection : Earthworms Internal Brain: what do you thin think it does? Pharynx: Swallows food food Esophagus: moves food food to crop, gizzard Seminal Vesicles:stor stores sperms Aortic Arches: hearts Nephridia: Like a kidney Crop: Stores food Intestines: transfers Gizzard: Grinds up food nutrients Nerve Cord: Sensors and receptors

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