Food delays absorption. High concentration in the stomach may delay gastric emptying. It is related to the water content or various tissues. It is poorly soluble in lipids, therefore a fat person has a higher blood concentration of alcohol. Concentration in urine is higher than blood.
Alcohol passes immediately in highly vascularized organs.
It passes immediately to the brain. It easily diffuses to the fetus, the amniotic fluid acting as reservoir in utero. Very small amounts through the urine. It oxidized mainly in the liver and much less in other organs especially stomach , intestine, kidney , bone marrow. The oxidation proceeds in steps.