<p>About two thirds of lymphocytes (all immunocompetent) are circulating in the blood and lymph systems. Most of these are T cells and long lived. In the lymphatic system they survey tissues. The other third do not circulate and are either short lived or immature, or can be specific cells destined for certain tissues i.e. cells that line connective tissue under the epithelium of the respiratory, intestinal and urogential systems.</p> | <p>About two thirds of lymphocytes (all immunocompetent) are circulating in the blood and lymph systems. Most of these are T cells and long lived. In the lymphatic system they survey tissues. The other third do not circulate and are either short lived or immature, or can be specific cells destined for certain tissues i.e. cells that line connective tissue under the epithelium of the respiratory, intestinal and urogential systems.</p> |