Neuronal Cells: Active transport is crucial in neurons for maintaining the resting membrane potential and propagating electrical signals through the sodium-potassium pump. Kidney Tubules: In the renal system, active transport mechanisms reabsorb vital nutrients, ions, and water from the filtrate back into the bloodstream. Intestinal Epithelial Cells: Active transport facilitates the absorption of nutrients like glucose and amino acids from the intestinal lumen into the bloodstream.