The Japanese word for Japan is æ¥æ¬, which is pronounced Nippon or Nihon and literally means the origin of the sun. The earliest record of the name Nihon appears in the Chinese historical records of the Tang dynasty, the Old Book of Tang.
The secondary immune response occurs the second time (3rd, 4th, etc.) the person is exposed to the same antigen. At this point immunological memory has been established and the immune system can start making antibodies immediately.
Difference Between Lymphocytes and Leukocytes. Lymphocytes are a type of white blood cells in the immune system. It has three major types, namely: Natural Killer (NK) cells, T-cells (Thymus cells) and B-cells (Bone cells). NK cells are a type of cytotoxic (cell toxic) lymphocyte that represent a major component of the inherent immune system.