The normal body temperature of human beings is __: [A] 96.4 °F [B] 97.4 °F [C] 98.4 °F [D] 99.4 °F
The Correct Answer and Explanation is :
The correct answer is [C] 98.4 °F.
Explanation:
The normal body temperature of human beings is generally considered to be around 98.6 °F (37 °C). However, in some contexts, 98.4 °F is also accepted as the “average” normal temperature. The body temperature can vary slightly between individuals, depending on factors such as age, time of day, physical activity, and individual metabolism.
Here’s why 98.4 °F (around 37 °C) is commonly used:
- Average Temperature: While 98.6 °F has traditionally been cited as the average normal body temperature, research has shown that this can vary slightly, and most healthy adults may have a body temperature anywhere between 97.8 °F and 99.1 °F. This means that 98.4 °F fits well within this range and represents an approximate average for many people.
- Fluctuations in Body Temperature: The body’s internal temperature is regulated by the hypothalamus and can fluctuate during the day. It is typically lower in the morning and rises slightly in the evening. Physical activity, food intake, and emotional states can also affect body temperature. Women may experience slightly higher body temperatures during ovulation.
- Measurement Site: The measurement of body temperature can vary based on where it is taken. Oral temperature is typically around 98.6 °F, while other methods like rectal measurements may yield a slightly higher temperature (usually about 0.5 °F higher), and axillary (underarm) readings tend to be lower.
- Fever: A body temperature above 100.4 °F is usually considered a fever, indicating that the body is fighting an infection or illness. A sustained temperature of 103 °F or higher is more concerning and should be treated promptly.
In conclusion, while the exact normal body temperature can slightly vary, 98.4 °F is a widely accepted value and falls within the expected range for a healthy adult.