Final answer:
B lymphocytes, or B cells, are more likely to be present in low-stress circumstances and function primarily by producing antibodies that bind to antigens. They differentiate into plasma cells that secrete these antibodies, unlike T cells, which are involved in the cell-mediated immune response.
Step-by-step explanation:
The type of white blood cell that is more likely to be present in low-stress circumstances is referred to as B lymphocytes (B cells). These immune cells function primarily by producing antibodies. Antibodies bind specifically to pathogen-associated molecules known as antigens. Once activated by binding to antigens, B cells differentiate into plasma cells, which secrete a soluble form of their surface antibodies. It is important to note that while both B cells and T cells are involved in the adaptive immune response, they have distinct functions. T lymphocytes (T cells) are crucial in the cell-mediated immune response against virus-infected cells and certain bacteria, with three main types: cytotoxic, helper, and suppressor T cells. Macrophages and natural killer cells are also key components of the immune system, with macrophages being able to phagocytize pathogens and produce chemicals that promote inflammation, and natural killer cells being involved in attacking a variety of infectious microbes and certain tumor cells.