Which of the following is a physiological response to cold stress?

• A. Seeking warm locations
• B. Shivering
• C. Adding layers
• D. Increasing activity/work rate

Answer: (B)

Cold stress triggers the body's automatic mechanism to generate heat, a physiological process that keeps core temperature stable. Shivering fits this role perfectly: it is an involuntary, rapid contraction of skeletal muscles that ramps up metabolic heat production, helping raise the body's core temperature when exposed to cold. This reflex is driven by the nervous system in response to a drop in temperature, making it a true physiological response. In contrast, seeking a warmer spot, adding layers, or increasing activity are behavioral actions—things a person does consciously to manage the cold rather than automatic bodily processes.