RT Book, Section A1 Mescher, Anthony L. SR Print(0) ID 1160662248 T1 Blood T2 Junqueira’s Basic Histology: Text and Atlas, 15e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781260026177 LK accessmedicine.mhmedical.com/content.aspx?aid=1160662248 RD 2024/03/29 AB Blood is a specialized connective tissue consisting of cells and fluid extracellular material called plasma. Propelled mainly by rhythmic contractions of the heart, about 5 L of blood in an average adult moves unidirectionally within the closed circulatory system. The so-called formed elements circulating in the plasma are erythrocytes (red blood cells), leukocytes (white blood cells [WBCs]), and platelets.