Which is a physiological stressor?

Which is a physiological stressor?

• A. Humidity
• B. Presence of unfamiliar people
• C. Pheromones
• D. Pain

Answer: (D)

Physiological stressors are things that directly affect the body's systems and signal actual or potential tissue damage, triggering the body’s stress responses. Pain does this in a clear, direct way: it activates nociceptors and, as the brain processes that danger signal, the autonomic nervous system and the HPA axis kick in. That produces real bodily changes—elevated heart rate and blood pressure, faster breathing, release of stress hormones like cortisol and adrenaline, and protective reflexes. The other options describe stimuli that can cause discomfort or anxiety but don’t inherently signal tissue damage: humidity is an environmental condition that can affect comfort, unfamiliar people are a social/psychological cue, and pheromones are chemical signals that influence behavior rather than indicate injury. So pain best fits as a physiological stressor.

Physiological stressors are things that directly affect the body's systems and signal actual or potential tissue damage, triggering the body’s stress responses. Pain does this in a clear, direct way: it activates nociceptors and, as the brain processes that danger signal, the autonomic nervous system and the HPA axis kick in. That produces real bodily changes—elevated heart rate and blood pressure, faster breathing, release of stress hormones like cortisol and adrenaline, and protective reflexes. The other options describe stimuli that can cause discomfort or anxiety but don’t inherently signal tissue damage: humidity is an environmental condition that can affect comfort, unfamiliar people are a social/psychological cue, and pheromones are chemical signals that influence behavior rather than indicate injury. So pain best fits as a physiological stressor.