Immunology: Defence Mechanisms Against Harmful Invaders

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Questions and Answers

Which of the following is NOT a type of invader the body must defend against?

Bacteria
Cancer cells
Hormones (correct)
Viruses

What is the primary difference between non-specific and specific defense mechanisms?

Specific defenses require prior exposure to an invader.
Non-specific defenses target a wide range of invaders, while specific defenses target specific invaders. (correct)
Specific defenses are faster to activate.
Non-specific defenses are more effective.

Which of the following is an example of a non-specific defense mechanism?

Production of antibodies
Humoral immunity
Cell-mediated immunity
Inflammation (correct)

What is the purpose of immunological memory?

<p>To provide long-term immunity to specific infections. (C)</p> Signup and view all the answers

What is an antigen?

<p>A substance that stimulates an immune response. (B)</p> Signup and view all the answers

Study Notes

Defense Mechanisms of the Body

Individuals face constant threats from harmful invaders throughout life, starting from prenatal development.
Types of invaders include:
- Bacteria
- Viruses
- Cancer cells
- Parasites
- Foreign (non-self) cells, such as those in tissue transplants.

Categories of Protective Measures

Protective measures are classified into two key categories:
- Non-specific defense mechanisms:
  - Offer broad protection against a wide variety of potential dangers.
- Specific defense mechanisms (Immunity):
  - Targeted resistance against particular invaders.
  - Develop immunological memory, which provides long-term immunity against specific infections.

Role of Antigens

An antigen is defined as any substance that triggers an immune response, prompting the body to produce specific defenses.

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Description

Learn about the various defence mechanisms the human body has developed to protect itself against harmful invaders such as bacteria, viruses, and cancer cells. This quiz covers non-specific defence mechanisms and more.