Does "at low blood levels" refer to "at low blood levels of ethanol"?

[NewHopeR]

Context:

Ethanol is a central nervous system (CNS) depressant that decreases neuronal activity, although some behav-
ioral stimulation is observed at low blood levels. This drug has cross-tolerance with other depressants, includ-
ing benzodiazepines and barbiturates, and all produce similar behavioral alterations. Alcohol is absorbed from
mucous membranes of the mouth and esophagus (in small amounts), from the stomach and large bowel (in mod-
est amounts), and from the proximal portion of the small intestine (the major site).

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In addition, does "the major site" mean "the major site of absorbing (large amount of) alcohol"?

[HanibalII]

Yes, "at low blood levels" refers to levels of ethanol in the blood.

Yes, "the major site" refers to the "major site of absorbing alcohol"




Not a teacher....Yet

[SoothingDave]

What would it be referring to if it wasn't talking about ethanol?