Human Immunity Lecture 5
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Questions and Answers

How do antibodies act to protect the body against invading agents?

  • Only by activation of the complement system
  • Neither by direct attack nor activation of the complement system
  • By both direct attack and activation of the complement system (correct)
  • Only by direct attack on the invader

    • What is the process called when multiple large particles with antigens on their surfaces are bound together into a clump?

  • Lysis
  • Neutralization
  • Precipitation
  • Agglutination (correct)

    • What is the term for the molecular complex of soluble antigen and antibody?

  • Neutralization
  • Precipitation (correct)
  • Lysis
  • Agglutination

    • What is the process called when antibodies cover the toxic sites of the antigenic agent?

    <p>Neutralization</p> Signup and view all the answers

    What is the type of immunity that has been discussed?

    <p>Active immunity</p> Signup and view all the answers

    What is the name of the system that is activated by antibodies to destroy the invader?

    <p>Complement system</p> Signup and view all the answers

    What percentage of plasma proteins are typically composed of immunoglobulins?

    <p>20%</p> Signup and view all the answers

    What is the function of the variable portion of an antibody?

    <p>Attaches specifically to a particular type of antigen</p> Signup and view all the answers

    What is the name of the antibody class that constitutes about 75% of the antibodies in a normal person?

    <p>IgG</p> Signup and view all the answers

    How many binding sites do IgM antibodies have?

    <p>10</p> Signup and view all the answers

    What determines an antibody's properties in the tissues?

    <p>The constant portion of the antibody</p> Signup and view all the answers

    What is the function of IgE antibodies?

    <p>Especially involved in allergy</p> Signup and view all the answers

    What happens in response to a foreign antigen invading the body?

    <p>The person's body develops antibodies or activated T cells</p> Signup and view all the answers

    How can temporary immunity be achieved without injecting an antigen?

    <p>By infusing antibodies or activated T cells from someone else</p> Signup and view all the answers

    How long do antibodies last in the body of the recipient?

    <p>2 to 3 weeks</p> Signup and view all the answers

    What is the term for conferring immunity through the transfusion of antibodies or T lymphocytes?

    <p>Passive immunity</p> Signup and view all the answers

    How long do activated T cells last if transfused from another person?

    <p>A few weeks</p> Signup and view all the answers

    What is the ability of the human body to resist damage from organisms or toxins?

    <p>Immunity</p> Signup and view all the answers

    What type of immunity is acquired after the body is first attacked by a bacterium, virus, or toxin?

    <p>Acquired Immunity</p> Signup and view all the answers

    What is the process of destroying swallowed organisms by the acid secretions of the stomach and the digestive enzymes?

    <p>Destruction</p> Signup and view all the answers

    What is the term for the resistance of the skin to invasion by organisms?

    <p>Cutaneous resistance</p> Signup and view all the answers

    What type of immunity is caused by a special immune system that forms antibodies and/or activated lymphocytes?

    <p>Acquired Immunity</p> Signup and view all the answers

    What are the antibodies in the immune system called?

    <p>Immunoglobulins</p> Signup and view all the answers

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