A 75-year-old man is admitted for dehydration after several…
A 75-year-old man is admitted for dehydration after several days of vomiting and diarrhea. He presents with low blood pressure, tachycardia, and dry mucous membranes. Laboratory testing reveals elevated renin, increased blood osmolarity, and slightly low sodium. Which physiological response is MOST likely occurring to restore fluid balance? A. Suppression of aldosterone to prevent excess sodium retention and correct the low sodium levelB. Stimulation of aldosterone secretion to enhance sodium reabsorption even if plasma sodium is lowC. Inhibition of ADH release to allow elimination of dilute urine and reduce blood osmolarityD. Increased insulin secretion to promote cellular glucose uptake and raise intracellular fluid volume