You smug:) I have one more question for you, and others, as well: What does central blood mean in this sentence: High concentrations of hyoscyamine are found in her central blood and urine. Thanks
"Central blood" is that which is taken from the vena cava, the vein which empties into the heart, as opposed to "peripheral blood" which is taken from a vien near the skin surface of a limb (usually the antecubital foss - inside the elbow)
The usual method of obtaining "central blood" is via a central venous catheter - picture here: