Chapter 47 Table of Contents Section 1 Nonspecific Defenses

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Presentation transcript:

Chapter 47 Table of Contents Section 1 Nonspecific Defenses The Body’s Defense Systems Table of Contents Section 1 Nonspecific Defenses Section 2 Specific Defenses: The Immune System Section 3 HIV and AIDS

Section 1 Nonspecific Defenses Chapter 47 Objectives Summarize Koch’s postulates for identifying a disease-causing agent. Describe how the skin and mucous membranes protect the body against pathogens. Describe the steps of the inflammatory response. Analyze the roles of white blood cells in fighting pathogens. Explain the functions of fever and proteins in fighting pathogens.

Identifying Pathogens Section 1 Nonspecific Defenses Chapter 47 Identifying Pathogens A pathogen is any agent that causes disease and can be spread to humans through the air, food, water, or direct contact with an infected animal or person. A disease that is caused by a pathogenic bacteria, virus, fungi, or protist is called an infectious disease. Koch’s postulates are “rules” for identifying the particular pathogen that causes a specific disease.

Chapter 47 Pathogen Section 1 Nonspecific Defenses Click below to watch the Visual Concept. Visual Concept

Section 1 Nonspecific Defenses Chapter 47 Koch’s Postulates

Chapter 47 Koch’s Postulates Section 1 Nonspecific Defenses Click below to watch the Visual Concept. Visual Concept

First Line of Defense: Barriers Section 1 Nonspecific Defenses Chapter 47 First Line of Defense: Barriers Nonspecific defenses, such as the skin and mucous membranes, are barriers to potential pathogens. In addition to being a physical barrier to pathogens, skin also produces sweat, oils, and waxes, which are toxic to many bacteria. A mucous membrane is a layer of epithelial tissue that covers internal surfaces of the body and secretes mucus, a sticky fluid that traps pathogens.

Second Line of Defense: Nonspecific Immunity Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity If a pathogen gets past the skin and the mucous membranes, the body triggers the second line of defense, which is nonspecific immunity. Nonspecific immunity works in the same way against any pathogen. Nonspecific immunity includes the inflammatory response, the temperature response, and certain proteins.

Second Line of Defense: Nonspecific Immunity, continued Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity, continued Inflammatory Response An inflammatory response is a series of events that suppress infection and speed recovery. When cells are damaged they release chemical messengers, such as histamine. Histamine is a substance that increases blood flow to the injured area and increases the permeability of surrounding capillaries.

Second Line of Defense: Nonspecific Immunity, continued Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity, continued Inflammatory Response, continued Fluids and white blood cells called phagocytes leak through capillary walls to fight any pathogens that may have entered the body. Phagocytes are cells that ingest and destroy foreign matter, such as microorganisms.

Second Line of Defense: Nonspecific Immunity, continued Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity, continued Inflammatory Response, continued The most common phagocyte in the body is called a neutrophil. A neutrophil is a large leukocyte that contains a lobed nucleus and many cytoplasmic granules.

Second Line of Defense: Nonspecific Immunity, continued Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity, continued Inflammatory Response, continued A macrophage is a white blood cell that engulfs pathogens and other materials. Another type of white blood cell that attacks pathogen-infected cells is called a natural killer cell.

Inflammatory Response Section 1 Nonspecific Defenses Chapter 47 Inflammatory Response

Inflammatory Response Section 1 Nonspecific Defenses Chapter 47 Inflammatory Response Click below to watch the Visual Concept. Visual Concept

Second Line of Defense: Nonspecific Immunity, continued Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity, continued Temperature Response When the body begins to fight pathogens, body temperature may increase. This rise in temperature is called a fever. The body triggers a fever in order to slow bacterial growth or to promote white blood cell activity. Though a moderate fever can be helpful, high fevesr can be dangerous.

Fever as Nonspecific Defense Section 1 Nonspecific Defenses Chapter 47 Fever as Nonspecific Defense Click below to watch the Visual Concept. Visual Concept

Second Line of Defense: Nonspecific Immunity, continued Section 1 Nonspecific Defenses Chapter 47 Second Line of Defense: Nonspecific Immunity, continued Proteins Proteins also provide nonspecific defenses. The complement system is a system of proteins that circulate in the bloodstream and become active when they encounter certain pathogens. Interferon is a protein released by cells infected with viruses that enables nearby cells to resist viral infection.

Section 2 Specific Defense: The Immune System Chapter 47 Objectives Identify and describe the parts of the immune system. Explain how the immune system recognizes pathogens. Compare the actions of T cells and B cells in the immune response. Relate vaccination to immunity. Distinguish between allergy, asthma, and autoimmune disease.

Chapter 47 The Immune System Section 2 Specific Defense: The Immune System Chapter 47 The Immune System The immune system includes the cells and tissues that recognize and attack foreign substances in the body. The components of the immune system are found throughout the body.

The Immune System, continued Section 2 Specific Defense: The Immune System Chapter 47 The Immune System, continued Bone marrow, the thymus, lymph nodes, the spleen, adenoids, and tonsils are all part of the immune system. Each part of the immune system plays a special role in defending the body against pathogens. The specialized cells of the immune system are called lymphocytes. Lymphocytes are white blood cells that exists in two primary forms: T and B cells.

The Immune System, continued Section 2 Specific Defense: The Immune System Chapter 47 The Immune System, continued B cells are white blood cells that are made in the bone marrow and complete their development there or in the spleen. B cells make antibodies. T cells are cells that are made in the bone marrow but complete their development only after traveling to the thymus. T cells also participate in many immune reactions.

Recognizing Pathogens Section 2 Specific Defense: The Immune System Chapter 47 Recognizing Pathogens Lymphocytes can provide specific defenses because they recognize pathogens by the antigens on their surface. An antigen is any substance that the immune system does not recognize as part of the body.

Recognizing Pathogens, continued Section 2 Specific Defense: The Immune System Chapter 47 Recognizing Pathogens, continued Because the lymphocytes do not recognize the antigen, they start a specific attack known as an immune response. Lymphocytes recognize a pathogen with molecules on their surface called receptor proteins.

Recognizing Pathogens, continued Section 2 Specific Defense: The Immune System Chapter 47 Recognizing Pathogens, continued An antigen has a complementary three-dimensional shape that allows the receptor protein to bind to it. This is how the lymphocyte recognizes the antigen. Only the specific receptor protein that is complementary to the antigen will be able to bind there.

How a Cytotoxic T Cell Recognizes an Infected Cell Section 2 Specific Defense: The Immune System Chapter 47 How a Cytotoxic T Cell Recognizes an Infected Cell

Recognition of Pathogens Section 2 Specific Defense: The Immune System Chapter 47 Recognition of Pathogens Click below to watch the Visual Concept. Visual Concept

Chapter 47 Immune Response Section 2 Specific Defense: The Immune System Chapter 47 Immune Response An immune response is a two-part assault on a pathogen. Both parts occur at the same time and require a specialized lymphocyte called a helper T cell. The two parts of the immune response are the cell-mediated immune response and the humoral immune response. T cells activate certain proteins that affect the behavior of other immune cells. These proteins are called cytokines.

Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 Immune Response, continued Cell-Mediated Immune Response In the cell-mediated immune response, cytokines activate more helper T cells and another type of T cell called a cytotoxic T cell. Cytotoxic T cells recognize and destroy cells that have been infected by a pathogen.

Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 Immune Response, continued Cell-Mediated Immune Response, continued Also produced during the cell-mediated immune response is a type of T cell called the suppressor T cell. Suppressor T cells are thought to shut down the immune response after the pathogen has been cleared from the body.

Cell-Mediated Immune Response Section 2 Specific Defense: The Immune System Chapter 47 Cell-Mediated Immune Response Click below to watch the Visual Concept. Visual Concept

Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 Immune Response, continued Humoral Immune Response The humoral immune response involves the action of B cells and occurs when antibodies are activated within body fluids. The humoral immune response occurs at the same time as the cell-mediated immune response. During the humoral response, cytokines stimulate B cells that have receptors that are complementary to the antigen to divide and change.

Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 Immune Response, continued Humoral Immune Response, continued Most B cells form plasma cells. A plasma cell is a white blood cell that produces antibodies. Antibodies are defensive proteins that react to a specific antigen or inactivate or indirectly destroy toxins. Antibodies use various methods to disable a pathogen or cause its destruction by nonspecific responses.

Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 Immune Response, continued Primary and Secondary Immune Responses The first time the body encounters an antigen, the immune response is called a primary immune response. During this first encounter, the immune system fights off the disease. After the disease is overcome, the immune system creates memory cells. Memory cells are a B cell or T cell that will recognize and attack the antigen or invading cell during subsequent infections.

Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 Immune Response, continued Primary and Secondary Immune Responses, continued The second time the body encounters an antigen, a secondary immune response occurs. During a secondary immune response, the immune response is faster and more powerful. Most of the time, the secondary immune response protects the body from reinfection by a pathogen.

Chapter 47 The Immune Response Section 2 Specific Defense: The Immune System Chapter 47 The Immune Response

The Immune Response, continued Section 2 Specific Defense: The Immune System Chapter 47 The Immune Response, continued

Primary and Secondary Immune Responses Section 2 Specific Defense: The Immune System Chapter 47 Primary and Secondary Immune Responses

Primary and Secondary Immune Response Section 2 Specific Defense: The Immune System Chapter 47 Primary and Secondary Immune Response Click below to watch the Visual Concept. Visual Concept

Immunity and Vaccination Section 2 Specific Defense: The Immune System Chapter 47 Immunity and Vaccination Immunity is the ability to resist an infectious disease. Immunity can come about in two ways: surviving an initial infection or through vaccination. Vaccination is the introduction of antigens into the body to cause immunity.

Immunity and Vaccination, continued Section 2 Specific Defense: The Immune System Chapter 47 Immunity and Vaccination, continued Vaccines Vaccination usually involves an injection of a vaccine. A vaccine is a solution that contains a dead or weakened pathogen or material from a pathogen that still contains antigens. The immune system will produce a primary immune response to the antigens. Memory cells can then provide a quick secondary immune response if the antigen ever enters the body again.

Chapter 47 Vaccine Section 2 Specific Defense: The Immune System Click below to watch the Visual Concept. Visual Concept

Problems of the Immune System Section 2 Specific Defense: The Immune System Chapter 47 Problems of the Immune System Sometimes the immune system can react to harmless antigens. Three examples of this are allergies, asthma, and autoimmune diseases. Allergies An allergy is a physical response to an antigen, which can be a common substance that produces little or no response in the general population.

Problems of the Immune System Section 2 Specific Defense: The Immune System Chapter 47 Problems of the Immune System Asthma Allergies can trigger asthma. Asthma is a respiratory disorder that causes the bronchioles to narrow due to an overreaction to substances in the air. During an asthma attack, the lining of the bronchioles and other respiratory tissues may also swell and become inflamed.

Problems of the Immune System Section 2 Specific Defense: The Immune System Chapter 47 Problems of the Immune System AIDS (acquired immunodeficiency syndrome) is a disease caused by HIV (human immunodeficiency virus). Infection by HIV causes the immune system to lose its ability to fight off pathogens and cancers. HIV infection usually progresses to AIDS in three phases.

Chapter 47 Objectives Describe the relationship between HIV and AIDS. Section 3 HIV and AIDS Chapter 47 Objectives Describe the relationship between HIV and AIDS. Distinguish between the three phases of HIV infection. Identify the two main ways that HIV is transmitted. Determine how the evolution of HIV affects the development of vaccines and treatment.

The Course of HIV Infection Section 3 HIV and AIDS Chapter 47 The Course of HIV Infection AIDS (acquired immunodeficiency syndrome) is a disease caused by HIV (human immunodeficiency virus). Infection by HIV causes the immune system to lose its ability to fight off pathogens and cancers. HIV infection usually progresses to AIDS in three phases.

The Course of HIV Infection, continued Section 3 HIV and AIDS Chapter 47 The Course of HIV Infection, continued Phase I Phase I of HIV infection is called the asymptomatic stage, because there are few or no symptoms of the disease. During this period of the disease the viruses increase rapidly due to replication. Phase I can last up to 10 years or more.

The Course of HIV Infection, continued Section 3 HIV and AIDS Chapter 47 The Course of HIV Infection, continued Phase II The beginning or worsening of symptoms marks the start of the second phase of HIV infection. B cells continue making antibodies, but T cells begin to decline steadily as the virus continues to replicate.

The Course of HIV Infection, continued Section 3 HIV and AIDS Chapter 47 The Course of HIV Infection, continued Phase III Phase III of HIV infection is the point where the number of helper T cells drops so low that they can no longer stimulate B cells and cytotoxic T cells to fight invaders. AIDS is diagnosed when the helper T-cell count drops below a certain level.

The Course of HIV Infection, continued Section 3 HIV and AIDS Chapter 47 The Course of HIV Infection, continued Phase III, continued AIDS is also diagnosed if an opportunistic infection has developed. Opportunistic infections are illnesses caused by pathogens that produce disease in people with weakened immune systems. These organisms usually do not creat problems in people with a healthy immune system. Drug therapy can slow the progress of HIV infection to AIDS, but there is no cure for AIDS.

Course of HIV Infection Section 3 HIV and AIDS Chapter 47 Course of HIV Infection

Chapter 47 Transmission of HIV Section 3 HIV and AIDS Chapter 47 Transmission of HIV HIV is transmitted by the transfer of body fluids containing HIV or HIV-infected cells. This most commonly occurs by sexual contact with an infected person or by use of syringes and hypodermic needles that have been contaminated with blood containing HIV. HIV cannot be transmitted through casual contact.

Known Routes of HIV Transmission Section 3 HIV and AIDS Chapter 47 Known Routes of HIV Transmission

Course of an HIV Infection Section 3 HIV and AIDS Chapter 47 Course of an HIV Infection Click below to watch the Visual Concept. Visual Concept

Vaccines and Treatments Section 3 HIV and AIDS Chapter 47 Vaccines and Treatments Effective treatments and vaccines for HIV are difficult to create, because HIV has a rapid evolution rate. Treatment is also difficult because HIV quickly becomes resistant to antiviral drugs. Most HIV treatments are expensive and require a complicated multidrug therapy.

Chapter 47 Spread of AIDS Section 3 HIV and AIDS Click below to watch the Visual Concept. Visual Concept