Final answer:
Animals use active transport to move substances against their concentration gradient, using energy in the form of ATP. An example of active transport is the sodium-potassium pump, responsible for maintaining ion balance in nerve cells.
Step-by-step explanation:
Active transport is a process used by animals to move substances against their concentration gradient, from an area of lower concentration to an area of higher concentration. This requires the use of energy, usually in the form of adenosine triphosphate (ATP).
An example of active transport in animals is the sodium-potassium pump, which is responsible for maintaining the ion balance in nerve cells. The pump actively transports three sodium ions out of the cell and two potassium ions into the cell, using ATP as the energy source.
Active transport is essential for various physiological processes in animals, such as nutrient uptake in the intestines, ion transport across cell membranes, and the removal of waste products from cells.
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