It also occurs in the human body in the ears, tip of the nose, and at joints. Bone has calcium salts in the matrix, giving it greater strength. Protein fibers provide elasticity while minerals provide elasticity. Two types of bone occur. Lacunae are commonly referred to as Haversian canals .
Spongy bone occurs at the ends of bones and has bony bars and plates separated by irregular spaces.
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.