Ch 3 The Immune System. 3.2 Factors Affecting the Immune System
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1 Ch 3 The Immune System 3.2 Factors Affecting the Immune System
2 Immunity Recall: if our bodies contain the antibodies for specific antigens, we have what is called immunity. We develop immunity when we get sick and our body makes antibodies to fight an antigen. We can also obtain immunity by receiving a vaccine (vaccination).
3 Vaccines A vaccine is a special version of an antigen. It is a weakened form of the disease Administered by needle usually (liquid form)
4 How do vaccines work? A small amount of weakened disease enters the body Your immune system creates antibodies to fight the disease You don t become ill because there is such a small amount of weakened disease But some antibodies remain They can be reactivated if the antigen enters your body in the future
5 More about vaccines Vaccines can be a one-shot deal or you may get another vaccination every few years. For example, we get tetanus shots every 10 years to bolster antibody production. Some vaccines you receive as a baby
6 Are vaccines risky? No, not generally Most vaccines are accompanied by mild side effects that don t last long Sometimes a severe allergic reaction can occur but this is rare. Extreme reaction to smallpox vaccine
7 Disorders of the Immune System Some people have an unusually high sensitivity to a certain substance. When the substance enters their body, the immune system recognizes it as an invader and the system over-reacts! This sensitivity is called an allergy
8 Vaccines Vaccine Video Vaccine Video 2
9 Allergies There are many things that can cause allergies. Food (milk, gluten, peanuts, strawberries ) Pollen, dust Cats, beestings Any substance that causes an allergic reaction is called an allergen.
10 Did You Know? Dust allergies may actually be due to the feces of dust mites that live in house dust! Dust mites eat dead skin flakes and make their home in your bed, carpet and old clothing!
11 Allergy Symptoms Common symptoms of an allergy Runny nose Watery eyes Why does this happen? When your body needs to fight an invader (an allergen) it releases a chemical called histamine Runny noses and watering eyes are side-effects of histamine We use drugs called anti-histamines to reduce these symptoms
12 Severe Allergic Reactions Some people have more severe allergies Ex: peanuts, bee-stings If they come in contact with these allergens they can have a severe reaction called anaphylactic shock Results in swelling, difficulty breathing, can be fatal People often carry adrenaline-shots (EpiPen) to reduce the effects.
13 Allergies video Allergies
14 Disorders of the Immune System AIDS Acquired Immunodeficiency Syndrome Infection of the immune system that can lead to death Caused by a virus called human immunodeficiency virus (HIV) HIV is a fierce pathogen that attacks the immune system and destroys it
15 What does HIV do to the body? HIV infects helper T cells Since helper T cells activate B cells, your body can no longer activate B cells or killer T cells The immune system has no way to fight the pathogen In other words, the immune system shuts down Other antigens or pathogens can enter and your body has no way to fight against them
16 How is HIV transmitted? HIV can be transmitted through Blood Semen HIV cannot be transmitted through Direct contact Shaking hands Saliva Sharing drinks, kissing
17 Cure for AIDS? There is currently no known cure for AIDS HIV keeps changing its structure slightly There are also several forms of the virus A person infected with HIV live 4-10 years AIDS currently affects more than 40 million people
18 Keeping Your Immune System What can you do? Eat healthy foods Exercise Wash your hands Keep yourself and your home clean Avoid drugs/ tobacco Get enough sleep Get vaccinations Be cautious (don t share drinks, etc..) Healthy
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