One difference between an MA and MS degree that some students donât think of is whether the degree is a terminal one. A terminal degree is the highest type of degree that an individual can receive in his or her field. An MA is usually a terminal degree, while an MS degree prepares students for working on their doctoral degrees later.
Aldosterone secretion is controlled by the RAA system and by concentrations of K+ in the circulation, which if increased evokes secretion of aldosterone.
1 Aldosterone stimulates Na + and water reabsorption from the gut, salivary and sweat glands in exchange for K 2  + . Aldosterone stimulates secretion of H + in exchange for K + in the intercalated cells of the cortical collecting tubules, regulating plasma bicarbonate (HCO 3 â) levels and its acid/base balance. (The increased potassium level works to regulate aldosterone synthesis by depolarizing the cells in the zona glomerulosa, which opens the voltage-dependent calcium channels .) The level of angiotensin II is regulated by angiotensin I, which is in turn regulated by renin, a hormone secreted in the kidneys.