-ATPase pumps protons into the gastric lumen to maintain an acidic environment necessary for digestion. 2. Powering Secondary Active Transport (Cotransport)
In the sprawling, walled metropolis of , life was anything but passive. The city was surrounded by a massive, semi-permeable wall known as the Membrane. Outside that wall lay the Extracellular Expanse—a chaotic wilderness where nutrients, salts, and water drifted aimlessly in high concentrations. role of active transport
: The balance between active ion pumping and passive ion leaking stabilizes intracellular solute concentrations, keeping cell volume constant. 5. Generating Membrane Potential and Bioelectricity -ATPase pumps protons into the gastric lumen to
But Cellulia had a secret weapon.