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Hydra (/ ˈ h aɪ d r ə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.They are native to the temperate and tropical regions. [2] [3] The genus was named by Linnaeus in 1758 after the Hydra, which was the many-headed beast of myth defeated by Heracles, as when the animal has a part severed, it will regenerate much like the mythical hydra's heads.
Hydra vulgaris, the fresh-water polyp, [3] is a small freshwater hydroid with length from 10 mm to 30 mm and width about 1 mm. [4] Description.
Hydra viridissima is a species of cnidarian which is commonly found in still or slow-moving freshwater [2] in the Northern temperate zone. Hydra viridissima is commonly called green hydra due to its coloration, which is due to the symbiotic green algae Chlorella vulgaris which live within its body. [ 3 ]
Hydras are a group of freshwater Cnidarians that are about 0.5 cm long. A hydra has a short, tubular shaped body. Hydras have a head that consists of a hypostome region and a foot that consists of a basal disc. The head portion of the hydra contains the mouth and tentacles, which allows for the catching and eating of food.
It was continued to use throughout the late 1900s with more cases reported of the condition. In the 21st century, food addiction are often associated with eating disorders. [5] The term binge eating is defined as eating an unhealthy amount of food while feeling that one's sense of control has been lost. [6]
It was found that rates of eating disorder appearances in children with either parent having a history of an eating disorder were much higher than those with parents without an eating disorder. [9] Reported disordered eating peaked between ages 15 and 17 with the risk of eating disorder occurrences in females 12.7 times greater than of that in ...
Human geophagia is a form of pica – the craving and purposive consumption of non-food items – and is classified as an eating disorder in the Diagnostic and Statistical Manual of Mental Disorders (DSM) if not socially or culturally appropriate. [6] Sometimes geophagy is a consequence of carrying a hookworm infection.
A variety of psychological disorders or mental illnesses such as eating disorders (anorexia, bulimia, binge-eating disorder), schizophrenia, bipolar disorder, and depression/anxiety, are associated with an increased risk of obesity and other obesity-related illnesses like diabetes and coronary heart disease.