For example, your body has an internal thermostat. During a winter day, in your house a thermostat senses the temperature in a room and responds by turning on or off the heater. Your body acts in much the same way. When body temperature rises, receptors in the skin and the brain sense the temperature change. The temperature change triggers a command from the brain. This command can cause several responses. If you are too hot, the skin makes sweat and blood vessels near the skin surface dilate. This response helps decrease body temperature.
Mark had been doing yard work all morning. He was soaked in sweat and was glad he could go inside now where it was air conditioned. Mark was only inside for a few minutes before he started shivering so he turned down the air conditioner.
When he was outside was Mark's body trying to warm itself or cool off??