Final answer:
Intracellular fluid (ICF) constitutes about 40% to 50% of an individual's total body weight. It is the key component of the cytosol/cytoplasm and accounts for about 60% of the body's total water content.
Step-by-step explanation:
The percentage of our total body weight that is made up from intracellular fluid (ICF) varies depending on factors such as body fat content. However, on average, the ICF makes up about 40% to 50% of an individual's total body weight. It is the principal component of the cytosol/cytoplasm within cells. If we consider water making up approximately 60% of the total water content in the human body and that the ICF constitutes a significant portion of this water, we can estimate its contribution to the overall body weight. Since water makes up 50-70% of an adult’s body weight and ICF accounts for around 60% of this water, then the ICF would represent approximately 30-42% of total body weight. Given these numbers, in a lean person, where the ICF accounts for about 50% of body weight, the lower end of this range would be more appropriate.