During the warm season, the body reacts to the heat by increasing the blood flow to the skin's surface. Which of the following process pairings is correct? 

• A. Stimulus - high temperature; sensor - skin nerve endings; response - increased blood flow to the skin's surface
• B. Stimulus - skin nerve endings; sensor - high temperature; response - increased blood flow to the skin's surface
• C. Stimulus - increases blood flow to the skin's surface; sensor - warm temperature; response - skin nerve endings
• D. Stimulus - high temperature; sensor - increases blood flow to the skin's surface; response - skin nerve endings

Answer: (A)