Answer:
the time necessary for one drop of blood to circulate through the body is one minute. The time it takes for one drop of cerebrospinal fluid to circulate through the spinal canal and brain is 30 seconds. So. . .any drug or chemicals that are transported through the blood-brain barrier gets circulated twice the time of the blood. This is one reason it is very easy to become addicted to drugs and very difficult to withdraw from the physiological need for addictive substances.
1. one drop of blood contains half a drop of plasma,5 million red blood cells,10 thousand white blood cells, and 250 thousand platelets!
2. you can probably wrap your blood vessels around the equator twice!