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Earthworms: Nature's Soil Recyclers

Learn about earthworms, nature's soil recyclers, as they eat soil and release beneficial nutrients. Discover their digestion process, nervous system, reproduction, gas exchange, muscular and circulatory systems, and anatomical terms.

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Earthworms: Nature's Soil Recyclers

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  1. Earthwormsnature’s recyclers

  2. Digestion • Earthworms eat soil and release “good stuff” for the soil • Mouth--crop (a sac for storage)-----gizzard (muscular structure that grinds)-----intestine---anus

  3. Nervous system • They have small simple brains in the anterior segment • Nerves in each segment join to form a main nerve cord • an earthworm is sensitive to touch, light, moisture, chemicals, temperature, and vibrations

  4. Reproduction • All worms carry two sets of sexual organs, they are hermaphrodites, but they cannot fertilize their own eggs—mating is still a necessary part of reproduction.

  5. How do earthworms exchange gases? • No gills or lungs • Exchanges oxygen and carbon dioxide by diffusion through its skin

  6. definition • Diffusion - the process by which molecules spread from areas of high concentratiion, to areas of low concentration. When the molecules are even throughout a space - it is called EQUILIBRIUM

  7. Muscular system • Circular muscles surround the worm's body and can make the body shrink or spread out. • Longitudinal muscles run the length of the body and can shorten or lengthen the worm

  8. Circulatory system • Have blood to carry nutrients, gases and wastes • Blood is carried in vessels • Across center of body earthworms have 5 “hearts” or pairs of vessels • Also has 2 large vessels that run the length of the body

  9. Anatomical terms • Dorsal Upper or back surface • Ventral Lower or front (belly) surface • Anterior Front side • Posterior Back side

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