What is one of the roles of adrenaline during stress?

One of the primary roles of adrenaline, also known as epinephrine, during stress is to increase heart rate and energy availability. When faced with a stressful situation, the body responds by activating the "fight or flight" response, which is mediated by adrenaline. This hormone is released into the bloodstream, causing several physiological changes that prepare the body to react swiftly.

One significant effect of adrenaline is its ability to increase heart rate, which helps pump more blood to vital organs and muscles, ensuring they receive adequate oxygen and nutrients during stressful situations. Additionally, adrenaline triggers the release of glucose and fat stores into the bloodstream, providing a quick source of energy that the body can access to fuel rapid physical responses. Together, these effects enhance an individual’s ability to respond to immediate challenges or threats, making option C the correct choice.