But what happens when the cell needs to move something up the hill?
Active transport needs energy because it moves substances against their natural flow (from low to high concentration), defying the second law of thermodynamics (which states systems naturally move towards disorder/equal distribution). why does active transport need energy
Active transport is the cell’s way of moving materials "uphill"—against the natural flow. 1. Fighting the Concentration Gradient But what happens when the cell needs to
In nature, molecules naturally move from where they are crowded to where they are spread out (diffusion). Active transport does the opposite: it pushes molecules from an area of to an area of high concentration . Since you are working against the natural laws of physics, the cell must "pay" for this movement with energy. 2. Moving Through Membrane "Pumps" Since you are working against the natural laws
Transport requires specialized transmembrane carrier proteins.
This action maintains the resting membrane potential required for neurons to fire electrical signals. Nutrient Absorption in the Gut The Engine: Sodium-Glucose Luminal Cotransporters.
