Answer questions 5 through 10 by choosing responses from the following: a. ammonium ions b. bicarbonate c. calcium d. chloride e. hydrogen ions f. magnesium g. phosphate h. potassium i. sodium j. water Substance regulated by ADH's effects on the renal tubules.

Video transcript

Hi, everybody. Let's take a look at our next question. It says A DH affects the reabsorption of which of the following molecules in the kidneys. A sodium ions. B water C magnesium ions, D calcium ions. Well, let's recall what A DH stands for. And that's anti diuretic hor moon. And we can sort of remember what this does if you remember that a diuretic causes your body to release more water. So when the anti diuretic hormone causes the body to reabsorb more water. So it causes the body to reabsorb more water. So our answer is going to be choice B and how does that work? A lot of the ions or other answer. Choices are all ions which are often actively transported often in balance with each other through various transport proteins. But how does water get reabsorbed more? We often think of water as being driven by osmotic pressure. But in this case, A VH works by increasing the expression of aquaporin and aquaporin are of course the specialized water transport proteins. So it causes more aquaporin to be present in the distal convoluted tubule and the collecting duct. So water does move by osmotic pressure. But with more aquaporin present, more water can come through and be reabsorbed. So our answer again is choice be water as the molecule that gets reabsorbed more in the kidneys due to the effects of a DH. See you in the next video.