Question

which structure in humans control the inward and outward flow of substances from the organs ?​

Answer 1

Answer:

cell membrane

Every cell in the body is enclosed by a cell (Plasma) membrane. The cell membrane separates the material outside the cell, extracellular, from the material inside the cell, intracellular. It maintains the integrity of a cell and controls passage of materials into and out of the cell.

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Answer 2

veins and cappillaries