Question

1. which feedback mechanism most likely explains the return to normal temperature? (still referring to the data in #17)a. shivering produces heat to raise temperatureb. sweating increases to release heatc. blood vessels expand to cool the bodyd. the nervous system stops sending signals

Explanation:

Step1: Analyze each option

• Option A: Shivering produces heat to raise temperature. This is a response when the body is cold (below normal), not when returning to normal.
• Option B: Sweating increases to release heat. Sweating is a mechanism to cool the body. When the body is above normal temperature, sweating increases to release heat (through evaporation) and bring the body temperature down (towards normal).
• Option C: Blood vessels expand to cool the body. While vasodilation (blood - vessel expansion) does help in cooling (by allowing more heat to be radiated from the blood near the skin surface), it is not the most direct process related to the body's return to normal temperature in the context of a feedback mechanism as directly as sweating. Sweating is a more active heat - loss process.
• Option D: The nervous system stops sending signals. The nervous system is constantly involved in regulating body temperature (it doesn't just stop sending signals when returning to normal; it adjusts the signals).

Step2: Determine the correct answer

Based on the analysis of how the body regulates temperature (homeostasis), sweating is a key process in reducing body temperature (when it is above normal) to return it to normal.

Answer:

B. Sweating increases to release heat