Question

based on the image provided, which of the following is the first to appear at the site of tissue damage? (image omitted) click to view larger image. options: histamines, neutrophils, platelets, macrophages. question 36 1 pts an autoimmune disease could occur if options: the antibodies produced in an earlier infection were reactivated in the bloodstream, a helper t cell was unable to match its receptor to the antigen of an infectious agent, b cells and t cells were unable to recognize the self - antigens displayed by host cells, b cells fail to recognize and interact with helper t cells.

Explanation:

First Question (Tissue Damage Response)

When tissue is damaged, the first response involves platelets (thrombocytes) arriving to initiate blood clotting and stop bleeding. Histamines are released later to cause inflammation, neutrophils and macrophages are part of the immune response that comes after the initial hemostasis (platelet action).

Autoimmune diseases occur when the immune system fails to recognize self - antigens, attacking the body's own cells. If B and T cells can't recognize self - antigens (option C), they may attack host cells. Reactivated antibodies (A) are part of memory response, helper T cell - antigen mismatch (B) relates to ineffective immune response to pathogens, and B - T cell interaction failure (D) affects adaptive immunity but not self - recognition for autoimmunity.

Answer:

Platelets

Second Question (Autoimmune Disease)