<P> Note: aldosterone synthase is absent in other sections of the adrenal gland . </P> <P> Aldosterone synthesis is stimulated by several factors: </P> <Ul> <Li> increase in the plasma concentration of angiotensin III, a metabolite of angiotensin II </Li> <Li> increase in plasma angiotensin II, ACTH, or potassium levels, which are present in proportion to plasma sodium deficiencies . (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 . </Li> <Li> Serum potassium concentrations are the most potent stimulator of aldosterone secretion . </Li> <Li> the ACTH stimulation test, which is sometimes used to stimulate the production of aldosterone along with cortisol to determine whether primary or secondary adrenal insufficiency is present . However, ACTH has only a minor role in regulating aldosterone production; with hypopituitarism there is no atrophy of the zona glomerulosa . </Li> <Li> plasma acidosis </Li> <Li> the stretch receptors located in the atria of the heart . If decreased blood pressure is detected, the adrenal gland is stimulated by these stretch receptors to release aldosterone, which increases sodium reabsorption from the urine, sweat, and the gut . This causes increased osmolarity in the extracellular fluid, which will eventually return blood pressure toward normal . </Li> <Li> adrenoglomerulotropin, a lipid factor, obtained from pineal extracts . It selectively stimulates secretion of aldosterone . </Li> </Ul> <Li> increase in the plasma concentration of angiotensin III, a metabolite of angiotensin II </Li>

Which of the following is aldosterone able to affect