1 The kidneys are used to remove excess water and ions from the blood. 2  These are then expelled as urine. 3  The kidneys perform a vital role in homeostatic regulation in mammals, removing excess water, salt, and urea from the blood.
Ectoparasites Parasites that live on the outside of the host, either on the skin or the outgrowths of the skin, are called ectoparasites. They are directly transmitted between hosts.
Diagnosing Mysterious âBug Bitesâ. Parasitosis is the condition of being parasitized, bitten, or lived on by another organism. Recognizing this condition in people, however, is not always easy, and undiagnosed âbitesâ are one of the most frustrating of all pest control problems. This fact sheet is intended to shed some light on situations where diagnosis of a biting problem is difficult to obtain.