Which of the following body parts constitute 9% of total body surface area?

The option indicating that the head, chest, abdomen, both arms, and each leg constitute 9% of total body surface area reflects the application of the "Rule of Nines," which is a standardized method used to assess burns and injuries. In this framework:

• The head is allocated approximately 9% of the total body surface area.

• Each arm also accounts for around 9%.

• The chest and abdomen combined contribute about 18% (9% for the chest and 9% for the abdomen).

• Each leg is assigned approximately 18% of total body surface area (9% for the front and 9% for the back).

When considering the components outlined in this option, they contribute to the total of 9%, fitting the criteria specified in the question. Thus, knowledge of the "Rule of Nines" is essential for accurately assessing burn injuries and understanding how to calculate total body surface area affected by burns or other conditions.

Understanding the contributions of these body parts is crucial for effective treatment and management of patients suffering from significant injuries. This approach is fundamental in emergency medicine and protocols for burn treatment.