How is the heart
used to maintain homeostasis during exercise?

The cardiovascular system helps to maintain homeostasis with respect to body temperature. An increased heart rate increases the delivery of blood to your skin. Increased blood flow to your skin and sweating causes dissipation of heat, and body temperature remains within normal limits

Explanation:

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your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.