In this essay I will be analysing micro organisms and disease. Firstly I will be defining micro organisms and then explaining the key features of the main categories of microorganisms. Followed by the roles of commensals and pathogens I will then go on to explain how micro organisms are transmitted and the routes of entry to and exit from the human body of micro organisms. I will also be explaining the logical sequence of events that occur from entry of a micro-organism to the body to the appearance of symptoms of a disease and then go onto discuss why not all infections lead to a disease. Finally I will explain a logical sequence the signs, symptoms and treatments of yellow fever which is an infectious disease.
Micro organisms are
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Entamoeba histolycia is water borne pathogen which can cause diarrhoea or a more serious invasive liver abscess. When in contact with human cells, these amoebae are cytotoxic. There is a rapid influx of calcium into the contacted cell, it quickly stops all membrane movement save for some surface blebbing. Internal organization is disrupted, organelles lyses and the cell dies. The amoeba may eat the dead cell or just absorb nutrients released from the cell.
Giardia Iambilia it is commonly found in wild animals such as beaver, this graceful, flagellated organism may infect unwary hikers. Giardiasis can also be contracted via contaminated foods. There is some evidence that a heavy infection of attacked giardia physically blocks the important transport of nutrients across the epithelium.
Commensal bacteria which is normally referred to as harmless bacteria helps to keep our bodies healthy in many ways, they help us to digest foods and acquire nutrients such as vitamins B and K to encourage the immune system to develop and prevent colonization of bacterial pathogens that cause disease by competing with them. Pathogens are micro organisms such as bacteria, viruses and fungus which cause ailments. Majority of them enter the body via the digestive system by ingestion of contaminated fluids or foods and through the respiratory tracts by airborne infections. Pathogens or disease producers are microscopic organisms (viruses, bacteria etc) that can