Answer :

To determine the percentage of total body water located in the intracellular space, we need to understand the distribution of water within the human body. The human body is composed of a significant amount of water, which is found in different compartments:

1. Intracellular Fluid (ICF): This is the fluid contained within the cells and comprises the majority of the body's total water content.
2. Extracellular Fluid (ECF): This fluid is outside the cells and is further divided into interstitial fluid (between cells) and plasma (the liquid component of blood).

In general, the distribution of total body water is predominantly found within the intracellular space. After analyzing the percentages provided:

- a) 32%
- b) 43%
- c) 55%
- d) 68%

It is evident that the correct and most accurate percentage of total body water located in the intracellular space is:

d) 68%

So, the percentage of total body water that is found in the intracellular space is 68%.