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What kind of cells do SP-D opsonins specifically target?

a) B cells

b) T cells

c) Red blood cells

d) Bacterial cells

User Mamoo
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1 Answer

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Final answer:

SP-D opsonins specifically target bacterial cells by marking them for phagocytosis by cells like macrophages, which are part of the immune system's first line of defense.

Step-by-step explanation:

SP-D opsonins specifically target d) Bacterial cells. Opsonins, such as SP-D, are components of the innate immune system that tag pathogens for destruction. They do not directly interact with any of the body's own cells (like B cells, T cells, or red blood cells). Opsonins make it easier for phagocytic cells, such as macrophages, to recognize, engulf, and destroy pathogens such as bacteria.

  • Macrophages are an example of phagocytic cells that can engulf and digest cellular debris and pathogens.
  • The adaptive immune response is most directly effective against bacteria through the action of antibodies, which are produced by plasma cells.
  • Cytotoxic T cells, a component of the cellular adaptive immunity, work in concert with natural killer cells against virally infected cells.

User Mittmemo
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