Give the significance of concentration of substance in body fluid

Question

pls give me a simple explanation. thanks i need this to study in chemistry

Answer 1

Which body fluid?   Which substance?

The number of substances in any body fluid is extremely large and even controversial as far as exact numbers.

Unfortunately, this question does not have simple explanation.

This sounds like part of an assignment which means you probably have some condensed information about it in your textbook that your teacher wants you to study.   You should do that because that would be more productive.