Active transport uses energy from ATP to move substances across cell membranes against their concentration or electrochemical gradients, utilizing carrier and channel proteins. Energy from cellular respiration produces ATP which powers specific carrier proteins to actively transport substances in one direction at a faster rate than diffusion, enabling cells to regulate what moves in and out.

2.  Understand what is meant by active
transport, including the role of ATP as an
immediate source of energy, endocytosis
and exocytosis.
 Understand the involvement of carrier and
channel proteins in membrane transport.

3.  This movement enables
cells to move substances
across membranes against
a concentration or
electrochemical gradient
using energy supplied by
the cell.

4.  Involves carrier protein
 Some carrier proteins are very specific, some
work with similar substances.

5.  Energy for active transport provided by cellular
respiration, which produces ATP.

6.  Active transport is a one-way system for each
specific substance. Moves substances in one
direction.
 Substances move faster than diffusion.