Final answer:
Blood vessels constrict during a fight-or-flight response to redirect blood to vital areas such as skeletal muscles and the brain that are crucial for responding to danger.
Step-by-step explanation:
During a fight-or-flight response, blood vessels going to the skin and internal digestive organs constrict and get smaller. This physiological change is to redirect blood to the areas that are directly involved in responding to the threat, primarily the skeletal muscles and the brain. Hence, the correct answer to why blood vessels constrict during a fight-or-flight response is to redirect blood to areas involved in the panic response.
By diverting blood away from the digestive system and skin, the body can focus on the muscles and organs that require immediate attention and energy to either fight the threat or flee from it. The constriction of vessels helps in maintaining increased blood pressure and flow to vital areas, ensuring that oxygen and nutrients are rapidly delivered to them.