You have a stock solution of PFA at 16% (V/V) but will need to use it at 3.7% (V/V) for your experiment, knowing that you need to make 10mls of the solution, what is the volume to be used: 231microlitres
2310mililiters
43.24microliters
43.24milliliters
2312microliters
432.4milliliters
231 millilitres
432.4 microliters

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

true is the answer : )