Active Transport - Physiology

()Map TRANSPORT ACROSS MEMBRANES (Map)

Introduction

Active transport is reliant on carrier proteins and thus follows the same rules as facilitated diffusion in that they are specific have a maximum rate and are subject to competition.

Differant Types of Active Transport

Primary Active Transport

Secondary Active Transport

The energy from this process is derived from the transport of another ion usually Na⁺ in a direction which reduces its potential energy. The released energy powers the process.

Uses

Sometimes secondary active transport transports things in the same direction as the sodium ions. For example glucose from the intestine and amino acids are transported this way. In other cases sodium flows into a cell to provide energy to remove other ions such as H⁺ and Ca²⁺