Chemistry for Physiology

    Chemistry for Physiology
    A solution that is isotonic to blood plasma is one which:
    The concept of tonicity involves reference to a membrane (in this case the plasma membrane of a RBC). Osmolarity is a property of the solution (and of how much solute is dissolved in it) and exists whether a semipermeable membrane is present or not.
    Author: rikazzz Comment
    Chemistry for Physiology
    What may be stated about a molecule that is polar?
    A polar molecule has opposite ends (poles) that are different from each other. That is, the molecule is not symmetrical. Choice A is wrong as lipids are not polar liquids.
    Author: rikazzz Comment
    Chemistry for Physiology
    Fructose is a sugar with a molecular formula C6H12O6. Given that the atomic weights are C = 12, H = 1 and O = 16, how many moles of fructose are there in 36 g?
    Mass of 1 mol of fructose = (6 × 12) + (12 × 1) + (6 × 16) = 72+12+96 = 180 g. 36 g is less than 1 mol. Number of moles = 36 g/180 g per mol = 0.2 mol.
    Author: rikazzz Comment
    Chemistry for Physiology
    One of the following is NOT a function of lipids in the body. Which one?
    Coenzymes are proteins (not lipids).
    Author: rikazzz Comment
    Chemistry for Physiology
    A 1 L IV bag contains 0.18% sodium chloride and 4% glucose. What mass of solutes would be dissolved in 100 ml of the solution?
    0.18% sodium chloride and 4% glucose means 0.18 g of sodium chloride per 100 ml and 4 g of glucose per 100 ml.
    Author: rikazzz Comment
    Chemistry for Physiology
    A buffer solution consisting of acetic acid and acetate ions (base) in a ratio of acid to base of 1:20 maintains the pH at 7.4. What is the ratio of the two components if the pH were to become 8.4 after addition of more of the basic component?
    As pH is a logarithmic scale, a rise in pH value by 1.0 (from 7.4 to 8.4) requires a change in the concentration of the basic component by a factor of 10. This is achieved if the ratio becomes 1–200.
    Author: rikazzz Comment
    Chemistry for Physiology
    In the vascular compartment of the body, what is the solvent?
    All these things are in the vascular compartment, but water is the solvent.
    Author: rikazzz Comment
    Chemistry for Physiology
    What is the condition known as hyperkalaemia characterised by?
    Kalaemia refers to potassium. “Hyper-” refers to more or an excess.
    Author: rikazzz Comment
    Chemistry for Physiology
    What does the pH of a buffered solution depend on?
    The pH of the buffered solution will change very little when either acid or base is added.
    Author: rikazzz Comment
    Chemistry for Physiology
    Which of the statements below is correct?
    Carbon dioxide that we breathe out enters the alveoli after diffusing there from the blood plasma. No other gas is excreted.
    Author: rikazzz Comment