Consider a study in which two different groups of rats are being exposed to exactly the same amount of painful shock.

The following is missing for the question to be complete:

One group is able to stop the shock by pressing a bar, while the other group can do nothing to stop the shock. What would you expect to happen to their stress response?

Answer: The rats that have control will have a smaller stress response

Explanation: Stress response is actually an organism's response to a situation that causes stress in the body and this response can therefore be a tendency to fight stress or a tendency to escape from a stressful situation. The body, during a stressful situation, that is, during a stress, secretes certain substances as adrenaline for example, which is a reaction to some situations that seem to threaten us or are challenging for us. Either way, stress response or "fight or flight" as it is called, determines our immediate response to some threatening situation. The longer the stress lasts, the higher the secretion of certain substances in the body, the greater the level of stress response. As in this case, rats that responded to stress and were able to stop and prevent the effects of shock, will have a lower level of stress and less stress response in terms of bodily emergency response to the challenge or danger because with the cessation of shock stops the body's response to situations, i. e the stress response ceases, the shorter the duration.