What is a significant physiological change that occurs with extensive burns?

• A. Increased metabolic rate
• B. Decrease in respiratory rate
• C. Reduction in heart rate
• D. Constant renal function

Answer: (A)

Extensive burns lead to a significant physiological change characterized by an increased metabolic rate. This elevation in metabolic rate occurs as the body responds to the trauma of extensive skin damage and the subsequent stress response. Burns result in a high demand for energy to support the healing process and maintain homeostasis. The body requires more calories and nutrients to repair tissues and combat any potential infections, which is why the metabolic rate can be markedly elevated.

As a direct response to the stress of the burn injury, the body also releases various hormones, such as catecholamines and cortisol, which further drive up metabolism. This hypermetabolic state can last for weeks or even months, depending on the severity and extent of the burns. Therefore, the correct answer reflects the body's adaptation mechanisms to cope with the physical trauma and increased demand for survival and healing associated with extensive burns.