What is rigour and why does it occur?

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Multiple Choice

What is rigour and why does it occur?

Explanation:
Rigour is the sudden, violent shivering that occurs when the body raises its core temperature in response to infection or inflammation. When harmful substances (pyrogens) enter the bloodstream, they trigger the hypothalamus to set a higher temperature. To reach this new fever level, the body produces heat through rapid muscle contractions—shivering—and constricts blood vessels to conserve heat. That combination causes the characteristic rigour you feel: intense shaking as the temperature climbs quickly. Once the new set point is reached, the shaking usually stops, and the person may feel hot or develop other fever symptoms. The other options describe different sensations or reactions that aren’t tied to this fever-driven heat-up process.

Rigour is the sudden, violent shivering that occurs when the body raises its core temperature in response to infection or inflammation. When harmful substances (pyrogens) enter the bloodstream, they trigger the hypothalamus to set a higher temperature. To reach this new fever level, the body produces heat through rapid muscle contractions—shivering—and constricts blood vessels to conserve heat. That combination causes the characteristic rigour you feel: intense shaking as the temperature climbs quickly. Once the new set point is reached, the shaking usually stops, and the person may feel hot or develop other fever symptoms. The other options describe different sensations or reactions that aren’t tied to this fever-driven heat-up process.

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