Question 13

Perspiring is a process used by the human body primarily to maintain a constant internal body temperature.

Perspiration plays a crucial role in thermoregulation, helping to maintain a stable internal body temperature despite external conditions. When the body heats up, sweating allows for heat loss through evaporation, ensuring the body does not overheat.

A) regulate internal fluid balance.

While perspiration does involve the loss of fluids, its primary purpose is not to regulate internal fluid balance. Instead, it is a response to temperature changes, and although maintaining fluid balance is important, it is secondary to temperature regulation.

B) maintain a constant internal body temperature.

This option accurately reflects the primary function of perspiration. The body sweats to cool itself down through evaporation, which is essential for maintaining a stable internal temperature, especially during physical activity or in hot environments.

C) eliminate excessive wastes.

Perspiration does involve the excretion of some waste products, such as urea and salts, but this is not its primary function. The kidneys are primarily responsible for waste elimination, making this option less relevant to the main purpose of perspiration.

D) regulate blood pressure.

Perspiration does not directly regulate blood pressure. Blood pressure is influenced by various factors including blood volume, vascular resistance, and heart function, and while sweating may have some indirect effects, it is not a primary mechanism for blood pressure regulation.

Conclusion

In summary, the primary purpose of perspiring is to maintain a constant internal body temperature through the cooling effect of evaporation. While other options touch on related processes, they do not capture the essential role of perspiration in thermoregulation, making option B the definitive correct choice.