Thursday, March 26, 2009

Protection From Diseases


The best protection from diseases is knowledge. The spread of infectious diseases can be prevented if people are more aware of how diseases are transferred from person to person and how dangerous they are. Although viral diseases cannot be cured, many of them can be prevented from the use of vaccines. Safe sex methods are effective in preventing being infected by an STD.

Allergies


An allergy is caused by the malfunction of the immune response to foreign or familiar substances. It occurs when a particular substance such as peanuts is mistaken by the immune system to be malicious. In defense, irritation, itching, and swelling occurs.

Disease Video

The movie was very interesting because it related to Mr. Hyke's lesson about pests and pesticides. The video talked about malaria and other diseases and what could be done about it. In my environmental class we learned about getting rid of pests and using pesticides and other methods to exterminate them. Although most methods provide an immediate, short term solution, it has long term effects such as the pests or diseases building genetic resistance through natural selection. This means that as DDT (also damaging to human health and the environment) is being used in Africa to prevent the spread of malaria, the mosquitos will eventually become immune to the pesticide. This will create a stronger generation of mosquitos, leaving the negative effects of DDT.

Breathing

Three ways breathing can change are apnea, sleep apnea, and hypernea. Apnea is a sudden stoppage of breathing caused by choking. Sleep apnea occurs during sleep and can be deadly. Hypernea is the increase of breathing rate caused by physical stress or emotional stress like exercise or anxiety.

The Cardiovascular System

The cardiovascular system is very complicated and extends throughout the whole body. The main function of the cardiovascular system is the transfer of blood which distributes oxygen to all the organs and maintains body temperature. I wish to understand processes and functions of the heart.