Mar 18, 2016. There are 11 major organ systems in our body. This includes the circulatory, respiratory, digestive, excretory, nervous, and endocrine systems. As well as the immune, skeletal, reproductive, muscle and integumentary systems.
Dental crowns can be made up of all different sorts of materials -- porcelain or a combination of porcelain with metal. The type that's chosen not only depends on where the tooth is situated, but what the condition of the tooth is (how discolored it is and how decayed it is), as well as the condition of the gums.
1 Crown- The top of a hat, the part that fits over a wearerâs head. 2  Eyelets- metal devices that are like small grommets stamped into the sides of the hat crown that allow air to flow inside the hat crown. 3  Fur Felt- A fur felt hat is a material made of animal fur. It is not made using the skin or pelt.