Physiology is a branch of biology that studies the processes and mechanisms that operate within an organism. The physiology of disease is frequently complex, involving interactions between various organs and tissue types. Insulin levels in the body, as well as the body's ability to utilise insulin, are linked to the pathophysiology of diabetes. In type 1 diabetes, there is no insulin at all, whereas in type 2 diabetes, the peripheral tissues resist insulin's effects. Diabetes has a complex pathophysiology that involves multiple hormones (i.e., insulin, glucagon, and growth). Because of the interaction of these hormones with the liver and their role in renal function, the pathological processes of this disease are difficult to nail down and vary greatly between patients.