May 2, Explanation: The aortic arches function like a human heart. Related questions What animal classification is a worm? What animal classification is a seahorse? What animal classification is a crab? What is animal classification? What are some examples of animal classification? What is a lophophore?
The earthworm has a complete digestive system consisting of a tube with an opening at one end for taking in food, and an opening at the other for eliminating undigested residues.
In between these two openings, food moves in one direction through regions specialized for processing and for transport. The earthworm does show discontinuous feeding patterns as its food may not be available at all times. One important thing that earthworms do is to plow the soil by tunneling through it. Earthworms are very important to the soil as the worm digs through the soil by eating dirt.
The soil will pass completely through the worm and out of the anus. Earthworm droppings — called castings when deposited atop the ground — are rich in nitrogen, calcium, magnesium, and phosphorus, and these are all important nutrients for healthy, prospering ecosystems. The earthworm is essential to composting; the process of converting dead organic matter into rich humus, a medium vital to the growth of healthy plants, and thus ensuring the continuance of the cycle of fertility.
Once in the burrow, the worm will shred the leaf and partially digest it, then mingle it with the earth by saturating it with intestinal secretions. Your email address will not be published. A closer look at segmented worms by Liezel Jun 7, General 0 comments. Submit a Comment Cancel reply Your email address will not be published. Search for:. An earthworm's "hearts" sit near the creature's mouth in five pairs, and function much like a human heart, though earthworms breathe oxygen through their skin and require moisture for respiration.
These heart-like organs bear a resemblance to arches, hence the name aortic arch. Some species of annelids regulate heartbeat using their muscles, while earthworms use nerve cells, much like vertebrates. In this way, an earthworm's hearts may seem more similar to a proper, human heart than other members of the annelid grouping.
Similarly, annelids have closed circulatory systems, meaning their blood stays within vessels rather than free-flowing in the body, as is the case with some other invertebrates like mollusks.
After an earthworm "breathes" through its skin, its aortic arches pump the oxygenated blood through its body for use using its dorsal and ventral blood vessels. The dorsal blood vessels carry the blood to the front of the worm, while the ventral blood vessels send it to the worm's backside.
Earthworms help improve soil quality by breaking down large pieces of organic matter into humus. Other creatures like birds use them for food, and humans occasionally use them as bait while fishing. Some humans also keep worms in specialized containers into which they toss organic waste.
The humans later use the leftover nutrient rich soil, or compost, for gardening projects. How Do Earthworms Move?
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