Final answer:
Stress is a physical and emotional response to a particular situation. It can manifest through physiological symptoms such as increased heart rate and tense muscles, which prepare the body to respond to danger.
Step-by-step explanation:
Stress is a response to your surroundings. You can show stress in many ways. Think about how you feel when you get really nervous or when you run very quickly. Your heart beats faster. You breathe harder. And your muscles tense. These responses prepare your body to respond quickly to danger.