Why would an increase in heart rate, breathing rate and usually an increase in perspiration accompany exercise?

Fluid Balance

Regulation of fluid balance ensures that amount of fluid lost from the body

is equal to the amount of fluid taken in. We must replenish the fluids lost through normal physiological activities, such as respiration, sweating and urination.

1. Why would an increase in heart rate, breathing rate and usually an increase in perspiration accompany exercise?
2. Explain the relationship (if any) between perspiration and urination. I need reference