The body's tissues and cells function efficiently within a relatively narrow temperature range,from 36° to 38° C (96.8° to 100.4° F).Factors that cause fluctuations in body temperature include which of the following? (Select all that apply.)

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The body's tissues and cells function efficiently within a relatively narrow temperature range,from 36° to 38° C (96.8° to 100.4° F),but no single temperature is normal for all people.For healthy young adults the average oral temperature is 37° C (98.6° F).In the elderly population,the average core temperature ranges from 35° to 36.1° C (95.0° to 97.0° F)because of decreased immunity.Time of day also affects body temperature with the lowest temperature at 6 AM and the highest body temperature at 4 PM in healthy people.The circadian rhythm alters body temperature about 0.5° C (0.9° F)throughout each day.An acceptable temperature range for adults depends on age,gender,range of physical activity,and state of health.Despite environmental temperature extremes and physical activity,temperature-control mechanisms of human beings keep the body's core temperature,or temperature of deep tissues,relatively constant during sleep,during exposure to cold,and during strenuous exercise.

The Body's Tissues and Cells Function Efficiently Within a Relatively