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The hormones produced by the adrenal glands play a significant role in controlling emotional responses, particularly through the secretion of cortisol and adrenaline. These hormones are involved in the body's stress response. When faced with stress or danger, adrenaline helps to prepare the body for a 'fight or flight' reaction, influencing emotions such as fear or excitement.

Cortisol, often referred to as the stress hormone, also affects mood and emotional stability, influencing how a person responds to stressors. Therefore, the control of emotional responses is directly tied to the functions of the adrenal glands and their hormonal output.

In contrast, other options relate to functions that are influenced by different hormones or systems in the body. Improved digestion is primarily regulated by hormones from the gastrointestinal system, while body temperature regulation is managed mainly by the hypothalamus and the autonomic nervous system. Immune function is enhanced by various hormones, but this process is largely mediated by cytokines and other immune system components rather than directly by adrenal hormones.