Gusano De Tierra (Ingles)

Earthworm
The earthworm is a representative of the annelids. This worm lives in rich, moist land. The earthworm is worldwide. Your body is divided into manysegments. Each segment has four pairs of bristles. The bristles are stiff hairs that help the earthworm move. The earthworm has no discernible head. The mouth islocated on the ventral side of the first segment. The digestive system of the earthworm has specialized regions, taking food by contractions of the muscles in the wallsof the pharynx. The muscle contractions push the food into the esophagus, the contraction and relaxation of muscles in the walls of the esophagus and otherdigestive organs is called peristalsis. The undigested food leaves the digestive tract through the anus. The circulatory system of the earthworm is a closed system,consisting of a dorsal vessel, which pumps blood to the front, and a ventral blood vessel that carries blood toward the rear. Each segment of the earthworm, except thefirst three and the last, contains a pair of nephridia. A is a structure nefridio filtered waste excretion, ammonia, urea, salts and excess water from fluidscoelom. Nefridio tubules, which are long and curled, opens outward through a pore in the ventral surface of the earthworm. The nervous system of the earthworm has abrain and a nerve cord nerves main lateral branches surrounding the digestive taco. The brain consists of two large glands that are in front of the pharynx.Earthworms consume dead organic matter and small organisms in the field. When buried, improve drainage and air circulation in the terrain, making it more loose and mixing.