In the context of the central distribution compartment, which tissues are included?

In the context of the central distribution compartment, which tissues are included?

• A. Skeletal muscles, fat, and skin
• B. Intravascular fluid, brain, heart, lungs, liver, and kidneys
• C. Gastrointestinal tract tissues
• D. Bone marrow

Answer: (B)

In the central distribution compartment, the drug rapidly equilibrates with the plasma due to very high blood flow. This space includes the intravascular fluid itself and highly perfused organs—brain, heart, lungs, liver, and kidneys—so they quickly mix with circulating drug and set up the initial distribution phase. Tissues like skeletal muscle, fat, and skin receive blood more slowly, so they belong to the peripheral compartment and take up or release drug later. The gastrointestinal tract tissues and bone marrow aren’t grouped with the central compartment in standard models, as their perfusion and distribution patterns aren’t part of that tightly perfused core.

In the central distribution compartment, the drug rapidly equilibrates with the plasma due to very high blood flow. This space includes the intravascular fluid itself and highly perfused organs—brain, heart, lungs, liver, and kidneys—so they quickly mix with circulating drug and set up the initial distribution phase.

Tissues like skeletal muscle, fat, and skin receive blood more slowly, so they belong to the peripheral compartment and take up or release drug later. The gastrointestinal tract tissues and bone marrow aren’t grouped with the central compartment in standard models, as their perfusion and distribution patterns aren’t part of that tightly perfused core.