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contain hemoglobin, which delivers oxygen and removes carbon dioxide from the body. The
white blood cells are of several kinds and form part of the body’s defence mechanism against
bacteria and viruses. The yellow fluid (pus) which can form pimples or is seen around a
splinter or cut, consists of many dead cells and is the remains of an attack by the white blood
cells on an invading organism.
The bloodstream also transports harmful chemical and biological agents.
The Cardiovascular System.
The Urinary System
The urinary system extracts waste products from the blood stream. The principal organs of
this system are the liver, the kidneys and the bladder. Of these the liver and the kidneys are
the most important.
The main function of the liver is to neutralise toxic substances and regulate body
temperature. The liver will try to convert these substances into a less harmful substance, this
process can result in damage to the liver, but it has a great deal of spare capacity.
ENSIGN| Unit IG2 – Element 7 – Chemical and Biological 9
Agents
