Bones joined are the ones that join and held in place with threads of collagen, they are joined with cartilage between the ends, these are the most complex joints and are an important aid in body mobility.
The periodontal ligament is the fibrous and connective tissue that joins the tooth to the alveolar bone or to the socket. The function of this ligament is supportive, sensory, and nutritive.
All the bones of the cranium, excepting the mandible, are joined by a fibrous joint called a suture. These sutures have the capacity to permit a small quantity of movement between the bones of the skull. Human cranium has around 20 sutures.
Passive transport moves molecules from one side of the membrane to the other with the energy of the chemical gradient (or concentration gradient). Otherwise, active transport uses the hydrolyzation of ATP to gain energy in order to move molecules across the membrane without taking into account the gradient.
An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion. Some atoms lose electrons and become positive ions. Others gain electrons and become negative ions.
