What is faster than diffusion, but requires the expenditure of energy?
  1. Inactive transport
  2. Active transport
  3. Facilitated diffusion
  4. Osmosis
Explanation
Answer - B - Active transport is faster then diffusion, but requires the expenditure of energy. Sodium is transported out of the cell by this process. Active transport is a biochemical process in which substance use energy to move across the cell membrane against the normal gradient. Therefore, it becomes faster than diffusion, but requires more energy use.
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