The time of Monocyte trasmit in blood is:

Ans. A. 10-20 hours. (Ref Guyton Physiology 11th/pg. 431)Guyton Physiology 11th/pg. 431.........."The monocytes also have a short transit time, 10 to 20 hours in the blood, before wandering through the capillary membranes into the tissues. Once in the tissues, they swell to much larger sizes to become tissue macrophages, and, in this form, can live for months unless destroyed while performing phagocytic functions. These tissue macrophages are the basis of the tissue macrophage system -a continuing defense against infection."Discussion:Life Span of the White Blood Cells & Platelets# The life of the granulocytes after being released from the bone marrow is normally 4 to 8 hours circulating in the blood and another 4 to 5 days in tissues where they are needed.# The monocytes also have a short transit time. 10 to 20 hours in the blood, before wandering through the capillary membranes into the tissues. Once in the tissues, they swell to much larger sizes to become tissue macrophages, and, in this form, can live for months unless destroyed while performing phagocytic functions.# Lymphocytes enter the circulatory system continually, along with drainage of lymph from the lymph nodes and other lymphoid tissue. After a few hours, they pass out of the blood back into the tissues by diapedesis. The lymphocytes have life spans of weeks or months; this life span depends on the body's need for these cells.# The platelets in the blood are replaced about once every 10 days; in other words, about 30,000 platelets are formed each day for each microliter of blood.