Final answer:
Physiological responses occur in the first stage of the stress process, the alarm reaction, as part of the general adaptation syndrome.
Step-by-step explanation:
Physiological responses occur in the first stage of the stress process, which is known as the alarm reaction. This stage is part of the general adaptation syndrome (GAS) described by Hans Selye, and it represents the body's immediate reaction to stress, characterized by the fight-or-flight response.