18. How does the intensity of
facilitated diffusion vary in
relation to the concentration
of the moved substance? What
is the limiting factor?

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Like simple diffusion diffusion
is more when the concentration
of the substance and
less intense the gradient lessens.
facilitated diffusion however is
a limiting : the quantity of
permeases that facilitate transport
through the . Even in a
in which the
gradient ofthe diffusing
increases, if there not enough
permeases perform the transport
will be no in the intensity
the diffusion. This is called
saturation the transport proteins
it represents the at which the
transport capacity of
substance across the is
achieved.