Blood is composed of cells and a fluid containing many inorganic and organic molecules. 110Red blood cells are very abundant in blood and function in oxygen transport. 111
6.2 The White Blood Cells
There are several types of white blood cells, and each type has a specific function in defending the body against disease. 115
6.3 Blood Clotting
Platelets are fragments of larger cells that function in blood clotting. 116
6.4 Plasma
Plasma is over 90% water and contains a variety of proteins and other molecules. 118
6.5 Capillary Exchange
An exchange of materials between blood and tissue cells takes place across cardiovascular capillary walls. 118Excess tissue fluid is absorbed by lymphatic capillaries and returned to cardiovascular veins. 119
6.6 Blood Typing
Blood is typed according to the antigens present on red blood cells. 120