The earthworm uses its skin as breathing organ

Worms such as earthworms usually have a closed circulation system while flatworms and roundworms have no circulation system. This means that they have no respiratory organ thus oxygen is taken in through the skin, body cavity or osmosis (Chandra, 2010).

The earthworm uses its skin as breathing organ; this is enabled by its moist skin which allows effective absorption of oxygen. The oxygen diffuses through the body and enters into the blood contained in the dense capillary network that is positioned next to the skin. The blood transport oxygen to other body cells (, 2010). In the body cells the carbon dioxide diffuses to the blood and it is then transported to the capillaries on skin where it finally diffuses to the body surface. Therefore, skin is an efficient respiratory organ in worms which have a “high surface area to volume ratio” (, 2010). Worms have no heart chamber except earthworms which have five hearts that pair off (Chandra, 2010).

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Flatworms mostly lives in water thus remove waste through osmosis and they have organ that get rid of surplus water in the body. This organ contains series of intersecting canals, which are on each side of the body and usually run through the length of the worm while roundworms have single opening for digestion that act as mouth as well as anus (Chandra, 2010). On the other hand, earthworms have two Nephridia openings; one gathers coelomic fluid and the other act as exit to the body wall and between these two openings waste is removed from the blood vessels (Chandra, 2010).

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