Presentation on theme: "Section 1 Infectious Disease. When you have an infectious disease, pathogens have gotten inside your body and caused harm. Pathogen: Organisms that cause."— Presentation transcript:
When you have an infectious disease, pathogens have gotten inside your body and caused harm. Pathogen: Organisms that cause disease. Infectious Disease: Disease caused by the presence of a living thing within the body.
Famous People 1860’s – 1880’s Joseph Lister: British Surgeon hypothesized that microorganisms caused infections. (washed his hands and equipment, what a brilliant man) Louis Pasteur: Showed that microorganisms cause certain kinds of diseases. Killing microorganisms can prevent disease. Robert Koch: demonstrated that each infectious disease is caused by a specific kind of pathogen.
There are 4 major groups of human pathogens. Bacteria Viruses Fungi Protists
Bacteria: one-celled microorganisms, damage Body cells directly, and indirectly through toxins. Toxin: Poison, that attacks kills or damages cells.
Viruses: tiny particles, much smaller than bacteria. Cannot reproduce unless they are inside a living cell. Colds and Flu are caused by viruses. Over 200 kinds. Meds don’t work, body must kill with immune system.
Protists: eukaryotic organisms unicellular, and multicellular organisms, such as the protozoans, slime molds, brown algae, and red algae. Examples: Malaria African Sleeping Sickness Amebic Dysentery
Immunity: The body’s ability to Destroy pathogens before they can cause disease.
Active Immunity: Your own immune system produces antibodies in response to the presence of a pathogen.
The Immune Response T cells and B cells keep the “memory” of how to destroy pathogens that have all ready entered the body. This response can last for life.
Vaccination The process by which harmless antigens are deliberately introduced into a person’s body to produce active immunity. Vaccine: consists of pathogens that have been weakened or killed but can still trigger the immune system.
Diseases that are not caused by pathogens in the body. Can not be transmitted from person to person.
An allergy develops in response to various foreign substances that set off a series of reactions in the body. Allergens: A substance that causes an allergy. Histamine: a chemical that is responsible For the symptoms of an allergy, such as Sneezing and watery eyes.
High levels of glucose in the blood and may even excrete glucose in the urine. The person’s body cells, however, do not have enough glucose. Insulin: enables body cell to take in glucose from the blood and use it for energy.
Short-Term Effects: Weight loss Feeling weak Hungry all the time Feeling thirsty Long-term Effects: Blindness Kidney Failure Heart Disease
Type I Begins in childhood or early adulthood Pancreas produces little or no insulin Type II Develops during adulthood Pancreas does not make enough insulin, or body cells do not respond normally to insulin Control through proper diet, and exercise.
A disease in which cells multiply uncontrollably, over and over, destroying healthy tissue in the process.
How Cancer Develops Tumors: Cells dividing out of control, not all tumors are cancerous. Cancer cells break off and destroy healthy tissue. Blood and Lymph vessels can carry cancer cells around the body for new tumors to form.
Causes of Cancer Tumors: Cells dividing out of control, not all tumors are cancerous. Cancer cells break off and destroy healthy tissue. Blood and Lymph vessels can carry cancer cells around the body for new tumors to form.
Cancer Treatment Surgery: Removal Drugs: Use of chemicals to destroy cancer cells. Radiation: High-energy waves to kill cancer cells, in specific spots.
Cancer Prevention Avoid Carcinogens Low-Fat Diet Regular Checkups… Catch it early