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In addition to basic research, this animal could also be suitable for studying wound-healing and regeneration processes; as yet unidentified metabolic products should be researched. Finally, Trichoplax adhaerens is also being considered as an animal model for testing compounds and antibacterial drugs. [27]
A later alternative to the rabbit test, known as the "Hogben test", used the African clawed frog, and yielded results without the need to cut the animal open. [6] Modern pregnancy tests continue to operate on the basis of testing for the presence of the hormone hCG in the blood or urine, but they no longer require the use of a live animal.
Bloodletting (or blood-letting) is the deliberate withdrawal of blood from a patient to prevent or cure illness and disease. Bloodletting, whether by a physician or by leeches , was based on an ancient system of medicine in which blood and other bodily fluids were regarded as " humours " that had to remain in proper balance to maintain health.
Following this, the tool would be used to draw out pus and "vicious humor." [9] Cupping vessels were also used to aid bloodletting. [10] [11] First, heat was applied to the area to warm it up. Then, the skin was cut with a scalpel, following this, the cup would be fastened to the area to draw blood.
The body consists of an outer layer of simple epithelium enclosing a loose sheet of stellate cells resembling the mesenchyme of some more complex animals. The epithelial cells bear cilia, which the animal uses to help it creep along the seafloor. [11] The lower surface engulfs small particles of organic detritus, on which the animal feeds.
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In contrast, phlebectomy is the removal of a vein. Phlebotomies that are carried out in the treatment of some blood disorders are known as therapeutic phlebotomies. [3] The average volume of whole blood drawn in a therapeutic phlebotomy to an adult is 1 unit (450–500 ml) weekly to once every several months, as needed. [4]
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