Chemistry for Physiology

    Chemistry for Physiology
    Which of the following ways of expressing a solution’s concentration is written as a number without units?
    Specific gravity of a solution is the ratio of the density of the solution to the density of water (which is 1.0). Consequently the density units “cancel out”.
    Author: rikazzz Comment
    Chemistry for Physiology
    A solution of 5% glucose is infused over a period of 3 h. If 250 ml of solution was used, how many grams of glucose were infused?
    5% glucose means 5 g per 100 ml of solution. 250 mL was used, therefore 2.5 × 5 = 12.5 g
    Author: rikazzz Comment
    Chemistry for Physiology
    Which of the following pH values would you expect to a dilute solution of a weak base to have?
    A base has a pH greater than 7.0. A weak base will have a value that is not much greater than 7.0
    Author: rikazzz Comment
    Chemistry for Physiology
    If humans venture to above 5000 m in altitude, hyperventilation (in response to low atmospheric pressure) results in a very low concentration of dissolved CO2 in the blood. What is the consequence of this?
    A deficiency of CO2 dissolved in blood will mean that that amount of carbonic acid produced is too low. This will cause blood pH to rise – a condition known as alkalosis.
    Author: rikazzz Comment
    Chemistry for Physiology
    What does “osmosis” refer to?
    The definition must include water molecules, crossing an SP membrane and a correct direction of movement.
    Author: rikazzz Comment
    Chemistry for Physiology
    Which of the following statements is closest to a correct definition of an acid?
    An acid produces hydronium ions (H3O+) when added to water. If the concentration of hydronium ions produced is low, then the acid is a weak acid.
    Author: rikazzz Comment
    Chemistry for Physiology
    Which of the body’s fluid compartments does the vascular compartment form part of?
    Vascular = blood which is almost synonymous with extracellular.
    Author: rikazzz Comment
    Chemistry for Physiology
    Extracellular fluid includes which of the following liquids?
    This choice includes more than choices A and B. D is wrong as liquid inside cells is not extracellular.
    Author: rikazzz Comment
    Chemistry for Physiology
    Which statement about the phosphate buffer is correct?
    Dihydrogen phosphate is able to destroy base by donating one of its hydrogen atoms (and in the process it becomes monohydrogen phosphate). Choice D is wrong as addition of acid would decrease the proportion of monohydrogen phosphate while increasing dihydrogen phosphate. This would make the ratio increase, that is, the “fraction” would be larger.
    Author: rikazzz Comment
    Chemistry for Physiology
    The twisting of a polypeptide chain into a characteristic shape such as a helix is an example of which of the following?
    The shape of the protein molecule is the tertiary structure of the protein.
    Author: rikazzz Comment