Question

7 multiple choice 5 points which of the following is an evolutionary ancient part of our immune system which include proteins that can assemble by themselves to create circular structures that poke holes in cells that have been targeted and labeled by immunoglobulins? antibodies fibrins complement renin - angiotensin system

Explanation:

• Antibodies are proteins produced by B - cells and are part of the adaptive immune system, not the ancient part described.
• Fibrins are involved in blood clotting, not the immune - related function of creating circular structures to poke holes in cells.
• The complement system is an evolutionary ancient part of the immune system. Complement proteins can assemble to form membrane - attack complexes (circular structures) that lyse (poke holes in) antibody - labeled target cells.
• The Renin - Angiotensin System is mainly involved in regulating blood pressure and fluid balance, not the immune function described.

Answer:

Complement