In the proximal tubule, the most important chance to the urine is reabsorption o

Question

In the proximal tubule, the most important chance to the urine is reabsorption of solutes only reabsorption of water only reabsorption of solutes and water reabsorption and secretion of solutes If mean arterial pressure rises from 100 to 120 mmHg (well within the normal range of MAP changes), glomerular filtration rate would be expected to decrease substantially stay about the same or increase slightly increase substantial No answer text provided As blood passes through CO_2-producing tissues, which of the following should increase in concentration in the blood? CO_2 H+ HCO_2- Two of these All of these.

Explanation / Answer

Answer 1: reabsorption of solutes and water (as explained below)

In the proximal tubule, most of the water and sodium ions are reabsorbed. More than 60% of sodium from the filtrate is reabsorbed this way by the proximal tubule.

Answer 2: stay about the same or increase slightly (as explained below)

Ideally a change in mean arterial pressure should result into a much higher glomerular filtration rate (GMR). However, an autoregulatory feedback mechanism allows the kidneys to keep the GMR in homeostasis, only that it might very slightly increase at the worst. A such, our bodies can handle pressure variations between 90-200mm Hg.

Answer 3: Two of these (as explained below)

70% of CO2 is carried in blood in the form of bicarbonate (HCO-3), 23% as carbaminohemoglobin and 7% as CO2.

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