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 (D)</p> Signup and view all the answers

What is the type of immunity that has been discussed?

<p>Active immunity (A)</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 (B)</p> Signup and view all the answers

What percentage of plasma proteins are typically composed of immunoglobulins?

<p>20% (B)</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 (B)</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 (C)</p> Signup and view all the answers

How many binding sites do IgM antibodies have?

<p>10 (A)</p> Signup and view all the answers

What determines an antibody's properties in the tissues?

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

What is the function of IgE antibodies?

<p>Especially involved in allergy (A)</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 (D)</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 (A)</p> Signup and view all the answers

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

<p>2 to 3 weeks (D)</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 (A)</p> Signup and view all the answers

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

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

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

<p>Immunity (B)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Cutaneous resistance (A)</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 (D)</p> Signup and view all the answers

What are the antibodies in the immune system called?

<p>Immunoglobulins (C)</p> Signup and view all the answers

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