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.
Asp (reptile) Asp is the modern Anglicisation of the word aspis, which in antiquity referred to any one of several venomous snake species found in the Nile region. It is believed that aspis referred in Egyptian mythology to what is now known as the Egyptian cobra. Historic representation.