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positively charged ion


negatively charged ion


a component that of stomach acid

atrial naturetic peptide (ANP)

a hormone that is secreted when blood pressure rises too high


a cation involved in the bone formation


the most abundant cation in the fluid surrounding cells


the most abundant cation inside cells


the adrenal hormone that promotes the reabsorption of sodium


a hormone that promotes calcium deposition in bones

antidiuretic hormone

a hormone secreted from the posterior pituitary that causes the kidney to reabsorb water

parathyroid hormone

a hormone that causes the kidney to readsorb calcium


the organ that regulates pH balance by altering carbon dioxide retention


the organ that regulates pH balance by altering urine acidity

carbon dioxide

substance that directly determines the acidity or alkalinity of a fluid

hydrogen ion

any substance that aids in maintaining a constant pH

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