Answer: When a macrophage engulfs a foreign antigen, it phagocytizes it (or breaks it down) using enzymes. The fragments (called epitopes) of the original antigen are transported to the cell surface so that helper T-cells that specifically match the antigen can recognize it. When that happens, the helper-T cells are able to trigger a specific immune response to that exact antigen by stimulating more helper-T cells to be produced and by triggering B-cells to secrete antigen-specific antibodies that mark infected cells for destruction by killer T-cells.
Answer: Macrophages are white blood cells that locate and phagocytize (eat) bacteria, viruses and dead or injured body cells. They also play a role in alerting the rest of the immune system to the presence of invaders. Macrophages arise from monocytes which are a type of white blood cells. When the monocytes leave the blood they become macrophages.
Answer: A cube, a cuboid, a parallelopiped are three examples. The name for a general shape of this family would probably be a quadrilateral hexahedron (six faces, each of which is a four-sided plane figure)..
Answer: I think you are talking about the inscription on the diamond...This is used so that if you ever give your jewelry to a jeweler you will be able to know for sure if he did not switch your diamond with a fake.
Answer: Barges are built for maximum weight bearing while other boats are built to move fast. Depth and shape of the hull is characteristic to the way the boat will be used and the speeds it will travel.
Answer: Macrophages primary function is to ingest foreign particles during phagocytosis either as a defence or for clean-up purposes. Macrophages also serve a role in immune response. They are able to fuse together to form a giant multinucleated cell to engulf large foreign body
Answer: While they are both responsible for phagocytosis and killing microorganisms, macrophages also activate T cells and initiate the immune response. They are also produced by different progenitors, (neutrophils by common granulocyte precursor and macrophages by and unknown precursor which then becomes a monocyte (immature macrophage)).