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.
Mental health is a state of well-being in which an individual realizes his or her own abilities, can cope with the normal stresses of life, can work productively and is able to make a contribution to his or her community.he WHO constitution states: Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.. An important implication of this definition is that mental health is more than just the absence of mental disorders or disabilities.