Answer :
Final answer:
A fever increases the body's metabolic rate, causing a rise in BMR. In Mark's case, his fever increases his BMR to approximately 2,278 calories to handle the increased energy needs.
Explanation:
Mark's Basal Metabolic Rate (BMR) measures the number of calories he needs to maintain basic body functions while at rest. Having a fever increases his metabolic rate by about 7% for each degree Fahrenheit his body temperature is above the normal 98.6ºF. Therefore, Mark's BMR increases with his fever. Specifically, his increased body temperature raises his BMR to approximately 2,278 calories.
This figure is derived from the 7% increase for each degree over normal body temperature. The extra energy is required for the body to produce more white blood cells, generate a fever to kill the pathogen and repair any tissue damage.
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