Activity 1

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Across
  1. 2. a type of defense that act immediately or within hours of a pathogen's appearance in the body
  2. 3. Antigen-presenting cells derived from bone marrow precursors and form a widely distributed cellular system throughout the body
  3. 5. Molecules capable of stimulating an immune response
  4. 7. Important cells of the immune system that are formed in response to an infection or accumulating damaged or dead cells
Down
  1. 1. A complex network of cells and proteins that defends the body against infection
  2. 4. pathogen is a biological agent that causes disease or illness to its host
  3. 5. A type of ummune system that is slower to respond but targets the pathogen more specifically, It involves specific cells – T and B lymphocytes.
  4. 6. A type of white blood cell that is of key importance to the immune system and is at the core of adaptive immunity