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.
Primary & Secondary Sexual Characteristics. Primary and secondary sexual characteristics refer to specific physical traits that differentiate males and females in sexually dimorphic species; that is, species in which males and females look different. Primary sexual characteristics are there from birth (for example, penises vs. vaginas).