For oxygen to diffue into a metabolically active eularyotic cell.
_(_())_(_())The cell must expend energy to trampert ompen into a cell.
?Transport probeirs are required to allow ovygen inte a cell, because onpen is a hydrophilic maleside.
?Kinetic energy must be present.
?A.P is required to activate tramport proteins.
_(_())_(_())Oxygen mant go against its concentration gradient into the cell.