How does the body primarily cool itself during exercise?

The body primarily cools itself during exercise through sweating and increased blood flow to the skin. When physical activity increases, the body's temperature rises due to both metabolic processes and muscle activity. To dissipate this excess heat and maintain a safe internal temperature, the body engages in thermoregulation.

One of the key mechanisms of thermoregulation is sweating. As sweat evaporates from the skin surface, it effectively removes heat from the body, thus lowering internal temperature. Moreover, blood flow to the skin increases during exercise, facilitating heat transfer from the core of the body to the periphery. This enhanced blood circulation allows for more heat to be carried away from the internal organs to the skin, where it can be released into the environment.

Therefore, the combination of increased sweating and enhanced blood flow to the skin plays a crucial role in keeping the body cool during physical exertion, making this the correct answer.