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.
Plural proboscises or proboscides (prÅ-bÅs'Ä­-dÄz') 1  A long, flexible snout or trunk, as of an elephant. 2  The slender, tubular feeding and sucking organ of certain invertebrates, such as butterflies and mosquitoes.