This ion is exchanged with hydrogen by ATP-driven antiporters in the wall of the stomach.
Glycyrrhizic acid, which is found in licorice, increases the secretion of this ion. Low blood levels of this ion predisposes patients to digoxin toxicity and causes T wave flattening and U waves appearing on EKG. This ion is exchanged with hydrogen by ATP-driven antiporters in the wall of the stomach. In the islets of Langerhans, ATP-sensitive channels conducting this ion are closed in response to (*) high glucose, triggering the release of insulin. Shaker channels in Drosophila conduct this ion. This ion exits the cell in the falling phase of an action potential. For 10 points, name this cation that is exchanged with sodium by active transport in neurons in order to maintain resting membrane potential.
Glycyrrhizic acid, which is found in licorice, increases the secretion of this ion.
potassium [or K+]