It releases a hormone that causes general metabolic activation. It releases a hormone that causes a reduction in blood calcium levels. It releases a hormone that directly activates osteoblasts. It releases a hormone that has a steroidal structure. It releases a hormone that contains one or more iodine atoms as part of its structure.
Cementum resembles bone in that it contains cells within lacunae in a mineralized matrix.
Enamel is only produced until the tooth erupts. The pulp cavity is avascular. Saliva contains substances that help to maintain the mineralization of enamel. The pulp cavity gets smaller with age, due to the action of odontoblasts in making new dentin. It absorbs amino acids apically and releases them from its lateral walls into the space between adjacent enterocytes.