BIO 322 Test 2 Questions and Verified Answers

Normal Saline contains 9 g of NaCl per liter. What is the molar concentration? (The molecular weight of NaCl = 58 g/mol) 300 mOsm/L 5.22 gm/L 156 mM 0.009 mM 156 mM 1 serving of orange juice (8 ounces) has 24 grams of sugar. How many mols of sugar is this? The MW of glucose is 180 grams/mol 24 grams * 180 grams/mol = 4320 mol 24 grams/180 g/mol = 0.13 mol 24 grams/180 g/m = 0.13 m 24 grams/ 180 grams/mol = 133 mM 24 grams/180 g/mol = 0.13 mol Pick the largest volume 100μL 1 dl 1 kG 1000mL 1000 mL Jennifer told us that she gives her cat subcutaneous injections to help with dehydration. What do you predict the composition of the injections to be, and why? (Thanks J!) -The injection is probably most like extracelular fluid, like a person woudl get for dehydration,. That is saline, or 140 mM NaCl solution. I may also contain some K+, maybe 5 mM, and Ca2+, around 2 mM. -Since the cat is dehydrated it's most likely sterile water, similar to what we drink when we are dehydrated. -I suspect it is a high K+ solution because K+ is so important. That is what we worry about, usually, when a person is dehydrated. -My bets guess is that it has high Na+ and high K+ and hi Ca2+. All of these are electrolytes and electrolytes are decreased during dehydration. The injection is probably most like extracelular fluid, like a person woudl get for dehydration,. That is saline, or 140 mM NaCl solution. I may also contain some K+, maybe 5 mM, and Ca2+, around 2 mM What is normal intracellular Na+ concentration? 10 mM 10 5 mM 140 mM 10 mM Where will you find more K+ in blood, and why? -Most K+ in blood is in formed elements. You can estimate the volume of formed elements to be 2.5 L in an average person, and the intracellular concentration of K+ is 140 mM. Compared to plasma which has a concentration of just 5 mM. -Most K+ is in the plasma because plasma volume is larger compared to intracellular volume. -Most K+ is in the formed elements because the intracellular concentration is around 5 mM and the volume of formed elements is roughly 2L if the hematocrit is 40. -Most K+ is in the plasma. You can estimate plasma volume at 3 L and plasma K+ concentration is roughly 140 mM. Compared to intracellular K+ which is 5 mM. Most K+ in blood is in formed elements. You can estimate the volume of formed elements to be 2.5 L in an average person, and the intracellular concentration of K+ is 140 mM. Compared to plasma which has a concentration of just 5 mM. How much NaCl is required to make 1 L of a 140 mM solution