Which statements accurately describe total body fat?

Total body fat encompasses various components, including both essential and nonessential fat reserves. Essential fat is vital for normal physiological functions, including hormone production, nutrient absorption, and temperature regulation. Nonessential fat, on the other hand, is stored fat that the body can use for energy when needed.

In addition, total body fat plays a significant role in determining total body mass. It contributes to overall weight and is an important factor when assessing an individual's body composition. Understanding the different types of fat and their roles is crucial for evaluating health risks and establishing fitness goals.

Thus, the correct answer is comprehensive because it recognizes that total body fat includes essential fat necessary for bodily functions, nonessential fat, and its contribution to overall body mass.