Cervical spine fractures can occur secondary to exaggerated flexion or extension, or because of direct trauma or axial loading. Pathology. The cervical spine is susceptible to injury because it is highly mobile with relatively small vertebral bodies and supports the head which is both heavy and acts as a lever.
The inactive molecule pepsinogen is cleaved in a strongly acidic environment to give off the active enzyme, pepsin. Pepsinogen is produced in the stomach by chief cells.
You can think of pepsin as the 'chief' digestive enzyme in the stomach because it is produced by the chief cells. This can help you remember the term, but I should clarify that pepsin is the active protein-digesting enzyme. The chief cells actually produce pepsinogen (an inactive form of pepsin).