A physiological response refers to the body's automatic reactions to various stimuli, such as stress, temperature changes, or injury. These responses are controlled by the nervous and endocrine systems, which work together to maintain homeostasis. For example, when faced with danger, the body may trigger the fight-or-flight response, increasing heart rate and releasing hormones like adrenaline. These responses can be observed in everyday situations. When you feel cold, your body shivers to generate heat, while sweating helps cool you down when it's hot. Such physiological changes are essential for survival, allowing the body to adapt to different environments and challenges.