Cells - Cell recognition and the immune system - - Phagocytosis Flashcards Preview

As-Level Biology > Cells - Cell recognition and the immune system - - Phagocytosis > Flashcards

Flashcards in Cells - Cell recognition and the immune system - - Phagocytosis Deck (9)
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How do phagocytes protect against pathogens, toxins, cancer cells or foreign tissues?

  1. The phagocyte is attracted by chemical products of the non-self material.
  2. The phagocyte has receptors that bind to the non self antigens of the material.
  3. The phagocyte engulfs the material (phagocytosis) and a phagosome is formed.
  4. A lysosome merges with the phagosome and lysozymes digest the material.
  5. Material debris is absorbed by the phagocyte. Antigens are presented on the surface of the phagocyte.


What is phagocytosis?

When foreign material is ingested by a phagocyte to form a phagosome.


T-Lymphocytes can be one of 2 types. What are they?

T-helper lymphocytes (Th)

Cytotoxic T-Lymphocytes (Tc)


Identify the 2 types of white blood cell.

Phagocytes (non-specific)

Lymphocytes (specific)


What are lysozymes?

Hydrolytic enzymes found inside lysosomes that digest foreign material.


What is a phagosome?

A vesicle containing foreign material within a phagocyte that is formed during phagocytosis.


Is phagocytosis a specific or a non-specific response to a non-self antigen?



Are Phagocytes 'antigen presenting cells'?

Yes - they present foreign antigens on their surface after engulfing a foreign material.


Describe how phagocytosis of a virus leads to presentation of its antigens

Phagosome FUSES with lysosome

lysosome contains lyzozymes which destroy virus]

antigen displayed on cell MEMBRANE of phagocyte (APC)

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