Causes of disease
A disease is defined as a physical or mental disorder or malfunction with a certain set of signs or symptoms.
Diseases may be caused by a single factor such as a pathogenic microorganism or have many causes some of which may depend on lifestyle.
Pathogens have many qualities that assist with the causing of diseases: they can gain entry to the host, colonise tissues of the host, resist defences of the host and cause damage to the host’s tissues. Microorganisms gain entry to the host through the skin and through exchange sites. For example, if someone has physical contact with an infected individual. All these characteristics lead to a disease occurring in the host. Some examples of pathogens are bacteria,
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This causes the chloride ions to move into the small intestine lumen – this lowers the water potential of the lumen - (Lumen refers to the cavity or channel within a tube or tubular organ). To try and balance the water concentration, water will move out of the blood and into the small intestine lumen by osmosis. The massive increase in water secretion into the intestine lumen leads to horrifically bad diarrhea, causing the body to become extremely dehydrated. This is another example of how disease is caused and the causes of diseases. Oral rehydration solutions are used to treat diarrheal diseases like cholera because many underprivileged areas do not have access to a drip - when fluid is inserted into the body directly through a vein. This can cause many ethical issues. For example, most diarrheal diseases effect children, meaning the oral rehydration solutions are now tested on children. However, the parents decide whether the child will participate in the trial, the child does not get a say. Many people argue that this is unethical and it can cause conflicts.
One thing that helps our body cope with a disease is our white blood cells. We rely on our white blood cells to resist disease by destroying and ingesting the pathogens and to produce antibodies and antitoxins that destroy pathogens and