Background: 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.

Situation: 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.

Question: Was Mark's body hot or cold outside?

Situation: 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.

Question: Was Mark's body hot or cold inside?

Situation: 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.

Question: When he was outside was Mark's body trying to warm itself or cool off??

Situation: 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.

Question: When he was inside was Mark's body trying to warm itself or cool off??

Situation: 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.

Question: Mas Mark's blood vessels dilated inside or outside?

Situation: 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.

Question: Mas Mark's blood vessels constricted inside or outside?

Situation: Ann couldn't believe her luck. Her cars air conditioning had broken yesterday and now she was stuck in traffic. As she sat in the car waiting for traffic to start moving she began to sweat.

Question: Was the temerature in the car rising or decreasing?

Situation: Ann couldn't believe her luck. Her cars air conditioning had broken yesterday and now she was stuck in traffic. As she sat in the car waiting for traffic to start moving she began to sweat.

Question: Were Ann's blood vessels dialating or contracting?

Situation: Ann couldn't believe her luck. Her cars air conditioning had broken yesterday and now she was stuck in traffic. As she sat in the car waiting for traffic to start moving she began to sweat.

Question: Was Ann's body temperature rising or falling?