The body has natural defence mechanisms against microbes that invade it. The first line of defence is the body's largest organ the __________. If holes are formed, then __________ from within the blood help the blood to __________ at the site of the wound.
Microbes can enter through the other orifices of the body. Body cavitives are lined with mucous membranes which produce __________ which traps microbes and also contains chemicals to kill them. The gastric juice (mainly __________) in the stomach will kill most bacteria that get that far and all fungi and viruses. If there are __________ numbers of bacteria the gastric juices will not kill them all.
If the body becomes infected then it can remove large numbers of microbes through physical means.
Should the pathogens enter the blood stream, __________ blood cells destroy them through the process of __________. Pathagens are engulfed and then digested by the __________ blood cell.
Pathogens cause damage to the body because they produce __________ (a natural poison). The body must first stop the production of these toxins (kill the pathogens) and then organs such as the liver can process and break down the toxins.