Description Metal Silver Purity 0.999 (99.9%) Weight 1 Troy Ounce (31,1 g) Diameter 37 mm Attributes Colorized, Proof Mintage 1000 Packaging Display Case and CoA The fourth silver coin from the Czech Mint’s series entitled “Human Body” is dedicated to the skeletal system – specifically the knee joint. The skeleton forms a solid support for the body and, along with the muscles, is another subsystem of the musculoskeletal system. The optimal compromise between minimum weight and maximum load-bearing capacity of bones is achieved by a combination of a spongy internal structure and a very strong outer layer. The body of a newborn has around 300 bones, but some fuse or disappear during the life. Therefore, an adult human usually has 206 bones. Many of them are connected by joints, which allow bending and turning. The largest and most complex joint in the human body is the knee, where three bones meet. Its load is enormous – when walking, a force equivalent to up to three times our weight acts on the knee. The reverse side of the coin, designed by medal maker Jan Štekl, DiS., features a colored cross-section of a bent human knee. The composition is supplemented with the Latin inscription ARTICULATIO GENUS (knee joint). On the obverse side, which is common to the entire series, you will find a double helix DNA.
