Primary Vs Secondary Active Transport -

A single ATP spent on primary transport can power the movement of thousands of other molecules via secondary transport. It’s an incredibly efficient system.

The substances move in opposite directions. Example: As sodium moves into a cell, calcium is pushed out. Key Differences at a Glance Primary Active Transport Secondary Active Transport Energy Source Direct hydrolysis of ATP Electrochemical gradient (stored energy) Protein Type Uniport pumps (mostly) Symporters and Antiporters Dependence Independent Dependent on Primary Transport Main Goal Establish a gradient Move molecules using an existing gradient Why Does It Matter? primary vs secondary active transport

There are two types of secondary active transport: A single ATP spent on primary transport can

Understanding the difference is critical for medicine and physiology: primary vs secondary active transport