BIOLOGY - Cells - Active Transport

The video tutorial explains the differences between diffusion, osmosis, and active transport. Diffusion and osmosis are passive processes where substances move from high to low concentration without energy. Active transport, however, requires energy to move substances against the concentration gradient from low to high concentration. This process is facilitated by protein carriers in the cell membrane, using energy from respiration. Active transport is crucial for absorbing nutrients in root hair cells and retaining essential substances in kidneys. Cells performing active transport often have many mitochondria to supply the necessary energy.

How do cells utilize active transport to absorb substances from dilute solutions?

What analogy is used to explain the process of diffusion compared to active transport?