For more on the meaning of colors for the color red. Orange is the color of social communication and optimism. From a negative color meaning it is also a sign of pessimism and superficiality. For more on the color orange. With the meaning of colors, in color psychology, yellow is the color of the mind and the intellect. It is optimistic and cheerful. However it can also suggest impatience, criticism and cowardice. For more on the color yellow.
The blood has several types of white blood cells including neutrophils, bands, eosinophils, basophils, monocytes and lymphocytes. Each fights infection in a different way. Neutrophils, for example, are one of the body's main defenses against bacteria. Neutrophils kill bacteria by ingesting them. Neutrophils can ingest five to 20 bacteria in their lifetime. Another type of white blood cell is called bands. Bands are immature neutrophils.
Granulocytes, Monocytes and Lymphocytes are 3 major types of white blood cell. White blood cells are the cells that help the body fight infection. There are a number of different types and sub-types of white blood cells which each have different roles to play. The three major types of white blood cells are: 1  Granulocytes. 2  Monocytes. 3  Lymphocytes.