Earthworms are found in the soil. In the soil they eat dead and decaying organic matter along with soil. In return, they help in aeration of soil by digging holes in it and enhance fertility of soil. In earthworms there is no specialized organ to do respiration. So, in earthworms respiration process takes place through its moist, thin and highly vascular skin. The oxygen gas absorbed by the skin diffuses into the blood and transported to all the cells of the body. In the cells, oxygen is used up for oxidation of food. During this process, carbon dioxide is produced. Then, this carbon dioxide mixes in the blood and diffused out of the body through its moist skin.
Test Your Understanding and Answer These Questions:
- Name the respiratory system of earthworm.
- Explain the process of respiration in earthworm.