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Bacteria - Biology of Human Beings - Lecture Notes, Study notes of Human Biology

These are the important key points of lecture notes of Biology of Human Beings are: Bacteria, Small Single, Red Blood Cell, Bacterial Infections, Normal Flora, (Disease Causing, Pathogenic, Bacterial Diseases, Bacteria on Surfaces, Sexual Contact

Typology: Study notes

2012/2013

Uploaded on 01/11/2013

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Download Bacteria - Biology of Human Beings - Lecture Notes and more Study notes Human Biology in PDF only on Docsity! Bacteria Bacteria are small single celled organisms (1-4µm in size; for comparison, a red blood cell is 6-8µm) Bacterial Infections Your normal flora consists of millions of bacteria living on the skin and in the digestive system. Some cause no harm, while others are beneficial. Pathogenic (disease-causing) bacteria cause infections by colonising tissues. Most symptoms are caused by bacteria releasing chemical toxins, which harm surrounding cells. How do bacterial diseases spread? • Via endospores in the soil- anthrax • Via bacteria on surfaces • Via inhaled bacteria- Leigonella • Via sexual contact- syphilis • Via food poisoning- E.coli, Salmonella, Campylobacter • Via bacteria in insects e.g. fleas & Yersinia pestis Human infection most often occurs when a person is bitten by a rat flea that has fed on an infected rodent. The bacteria multiply inside the flea, sticking together to form a plug that blocks its stomach and causes it to become very hungry. The flea then bites a host and continues to feed, even though it is unable to satisfy its hunger. During feeding, blood cannot flow into the blocked stomach, and consequently the flea vomits blood tainted with the bacteria back into the bite wound. The flea eventually dies from starvation! Treatments: • Sulfonamides- developed in the 1930’s • Antibiotics- penicillin & many others Docsity.com
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