Changes

==Introduction==

==Introduction==

Active transport is reliant on [[Transport Proteins - Physiology|carrier proteins]] and thus follows the same rules as [[Transport Proteins - Physiology|facilitated diffusion]] in that they are specific have a maximum rate and are subject to competition. Crucially they transport substances against their concentration gradient and so require energy to work.

Active transport is reliant on [[Transport Proteins - Physiology|carrier proteins]] and thus follows the same rules as [[Transport Proteins - Physiology|facilitated diffusion]] in that they are specific have a maximum rate and are subject to competition. Crucially they transport substances against their concentration gradient and so require energy to work.

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 [[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Acid / Base|'''H⁺''']] and [[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Calcium|'''Ca²⁺''']]

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 [[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Acid / Base|'''H⁺''']] and [[Essential Ion and Compound Balance and Homeostasis - Anatomy & Physiology#Calcium|'''Ca²⁺''']]

[[Category:Urinary System]]

[[Category:Transport Across Membranes]]

[[Category:Electrolytes]]

[[Category:Electrolytes]]