It is for this reason that the biobehavioural theory is said to be an integrated theory. Because of its integrated nature, the biobehavioural theory is considered appropriate in several spheres of human institutions. For example in healthcare, biobehavioral health is considered to be an innovative interdisciplinary program that enables students to explore all factors—biological, behavioral, social/cultural, and environmental—that influence the health of individuals and groups through the lifespan (Pennsylvania State University, 2011). Apart from health, the biobehavioural theory also allows for human behavior to be judged from sociological and psychological perspectives. With reference to this essay, therefore, the psychological perspective will be considered rather than sociological perspective.From a psychological perspective, the physiological aspect of biobehavioural theory could be said to be the basis of how we think, connecting the physical operation of the brain with what we actually say and do (Changing Mind, 2011). In other words, the physiological aspect of biobehavioural theory deals with our actions that pertain to our anatomical makeup. Considered as the mother of all psychological reasoning, physiological aspect of the biobehavioural theory is explained in much contest to the brain and its function than to the functioning of other parts of the body (Changing Minds, 2011). This is quite simple to understand and agree with because the brain controls all physical actions and behavior (Akakpo, 2002). Physiologically, human behaviors are affected by several secondary factors that have the brain as their primary cause.