The hypothalamic-pituitary-adrenal (HPA) axis in the brain is associated with stress situation due to high release of cortisol under any physiological stress stimulant.
The activity of HPA axis is result in stress further leading to depression under high alcoholism due to activity of alcohol on benzodiazepine sites. HPA axis is also leading to imbalance serotonin and adrenaline levels thus, result in eating disorders.
Immune secretions such as T-cell activity, phagocytosis is not going to cause any depression or eating disorders.
Thus, the options (a), (b) and (d) are incorrect.
The hypothalamic-pituitary-adrenal (HPA) axis in the brain is associated with stress situation due to high release of cortisol under any physiological stress stimulant.
Therefore, the correct option is – c). HPA activity.