What physiological response does the "fight or flight" mechanism trigger in the body?

The "fight or flight" mechanism is a physiological response activated in situations of perceived threat or danger. This response is crucial for survival and prepares the body to either confront the threat (fight) or flee from it (flight).

When the body engages in this reaction, various physiological changes occur. One significant response is the increase in heart rate, which enables more efficient blood circulation throughout the body. This increased blood flow enhances the delivery of oxygen and essential nutrients to muscles and organs that are critical for immediate physical activity. Additionally, there is a rise in oxygen consumption as the body demands more energy to mobilize resources quickly.

The other options present responses that are contrary to the body's needs during a high-stress situation. For instance, increased blood flow to the digestive system would divert resources away from the muscles and brain, which is not beneficial in a fight-or-flight scenario. Similarly, decreased heart rate and energy consumption would not support an effective response to danger. Lowered levels of adrenaline would inhibit the body’s readiness to respond effectively, as adrenaline is key in facilitating the heightened state of alertness and physical readiness. Thus, option C accurately reflects the physiological changes associated with the fight-or-flight response.