The term that accurate describes Gustav's physiological response is: alarm reaction.
The alarm reaction stage is characterized by what we can call the "fight-or-flight" response. This occurs when the body receives signal of danger or stress, and thereby puts the body on high alert.
When this occurs, the body initiates psychological response such as increased breathing and heart rate, which prepares the body to either protect or flee from the perceived danger.
Therefore, the term that accurate describes Gustav's physiological response is: alarm reaction.
Learn more about alarm reaction on:
https://brainly.com/question/7080680