The solid portions of spongy bone pick up stress. Note the haversian canal and surrounded by osteocytes and a mineralized matrix. Image from W.H. Freeman and Sinauer Associates, used by permission. Two types of cells occur. Plasma transports dissolved glucose, wastes, carbon dioxide and hormones, as well as regulating the water balance for the blood cells.
Platelets are cell fragments that function in blood clotting.
Note the red blood cells and the single neutrophil. Muscle fibers are multinucleated, with the nuclei located just under the plasma membrane. Most of the cell is occupied by striated, thread-like myofibrils . Within each myofibril there are dense Z lines . Each sarcomere has thick and thin filaments.