Defense Against Infectious Diseases Immune System The Lymphatic

The Lymphatic System Three basic functions Maintains body fluids at a constant level Absorbs

Immune System Innate Immune System – defense mechanisms that your body uses to protect

If a pathogen gets by the skin and secretions…. Phagocytes – a white blood

Macrophage – one type of phagocyte After a macrophage engulfs large numbers of

Inflammation of body tissues Inflammation (redness, swelling, pain and heat) occurs when body tissues

Adaptive Immune System Immunity – defense against a specific pathogen by building up a

Vaccinations Vaccine – a mixture of a harmless component of a disease-causing microbe, a

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Defense Against Infectious Diseases Immune System

The Lymphatic System Three basic functions Maintains body fluids at a constant level Absorbs fats from the digestive tract Helps body defend itself against disease

Immune System Innate Immune System – defense mechanisms that your body uses to protect you from MANY different types of pathogens Skin – the first line of defense; also home to lots microorganisms that inhibit the multiplication of pathogens Secretions – mucus, sweat, tears, saliva Secretions trap or kill off pathogens

If a pathogen gets by the skin and secretions…. Phagocytes – a white blood cell (WBC) that ingests and destroys pathogens by surrounding and engulfing them When a pathogen is present, phagocytes migrate out of your blood capillaries to the infected areas

Macrophage – one type of phagocyte After a macrophage engulfs large numbers of microbes and damaged tissue, they eventually die The infected area will contain a collection of dead WBCs and various body fluids = pus (eeeeewwwww!! But now you know what it is!)

Inflammation of body tissues Inflammation (redness, swelling, pain and heat) occurs when body tissues are damaged by pathogens (can also be a reaction to ANY type of injury) Injured cells release histamine – which is a chemical alarm system, causes blood vessels to dilate and inflammation to happen

Adaptive Immune System Immunity – defense against a specific pathogen by building up a resistance to it Antigen –foreign substances (proteins, bacteria, viruses, etc. ) that stimulate the production of antibodies in the blood Antibody – proteins produced in reaction to foreign substances (antigens) antibodies are specific to an antigen

Vaccinations Vaccine – a mixture of a harmless component of a disease-causing microbe, a dead or weakened pathogen or part of a microbe Pathogen = microbe A vaccine stimulates the immune system to increase defenses against the antigen Body builds up antibodies and can react quickly if exposed to the pathogen (antigen) again