Hiv Essay

Topics: AIDS, Immune system, Virus Pages: 3 (928 words) Published: December 12, 2013
BIOLOGY

ESSAY

HIV
transmission and prevention

The point of this essay is to write about what is HIV and how does it transmission work and how to prevent it. AIDS (Acquired Immune Deficiency Syndrome) is one of the worst pandemics the world has ever known. HIV (Human Immunodeficiency Virus) is the virus that causes AIDS was first discovered in a remote area of central Africa. It has since swept across the globe, infecting millions in a relatively short period of time. Since then AIDS has killed more than 28 million people that we know of. But first I am going to talk about living and non-livin characteristic of a virus. These are the characteristics for something to be considered living: 1. Homeostasis (Regulation of the internal environment to maintain a constant state)  2. Organization (Being composed of one or more cells, which are the basic units of life)  3. Metabolism (Consumption of energy by converting nonliving material into cellular components and decomposing organic matter)  4. Growth (Maintenance of a higher rate of synthesis than catabolism. A growing organism increases in size in all of its parts, rather than simply accumulating matter. The particular species begins to multiply and expand as the evolution continues to flourish)  5. Adaptation (The ability to change over a period of time in response to the environment)  6. Response to stimuli

7. Reproduction
Viruses lack cellular structurea and viruses do not have their own metabolism and require a host cell to make new products. Also, viruses cannot reproduce outside a host cell. Accepted forms of life use cell division to reproduce, but viruses just spontaneously assemble within host cells. Because of these virsues are considered non-living. HIV infects one particular type of immune system cell. This cell is called the CD4+T cell, also know as a T-helper cell. Once infected the T-helper cell turns into a HIV-replicating cell. HIV will slowly reduce the number...
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