ABSTRACT
This chapter shows a link between the cause and effects of exposure to occupational hygiene hazards. It describes the structure and functions of the main systems of the body and various types of movements that the human body can perform. Blood enters the atrium where it is held for a moment before passing through the bicuspid valve and into the left ventricle. The alimentary canal or gastrointestinal tract is a continuous tube that begins below the oral cavity and terminates at the anus. Exposure to occupational hygiene hazards may occur through the digestive system, although it is the least likely route of entry. The liver is one of the body's most important organs as it maintains blood glucose levels, metabolises fat and proteins, stores vitamins and minerals and has biotransformation functions. The endocrine system manufactures and releases hormones. Hormones are chemical substances that provide directions and messages to the body's cells.
