T cells or T lymphocytes are a type of lymphocyte (in turn, a type of white blood cell) that plays a central role in cell-mediated immunity. They can be distinguished from other lymphocytes, such as B cells and natural killer cells (NK cells), by the presence of a T-cell receptor (TCR) on the cell surface. cells or T lymphocytes are a type of lymphocyte (in turn, a type of white blood cell) that plays a central role in cell-mediated immunity. They can be distinguished from other lymphocytes, such as B cells and natural killer cells (NK cells), by the presence of a T-cell receptor (TCR) on the cell surface.
Definition of Health According to WHO. World Health Organization (WHO), defined Health as being âa state of complete physical, mental, and social well-being and not merely the absence of disease or infirmityâ in 1948. Since then only few of the publications believed on the definition of health and its evolution in the first 6 decades.
A widely accepted definition of health by mental health specialists is psychoanalyst Sigmund Freud's definition: the capacity to work and to love - considered to be a simple and more accurate definition of mental health.