Anatomy and Physiology

    Endocrine System
    Which one of the following is NOT true of peptide hormones?
    The receptors for peptide hormones are located on the plasma membrane as they are unable to penetrate the plasma membrane.
    Author: rikazzz Comment
    Chemistry for Physiology
    One of the statements below about buffers is correct. Which one?
    A buffer has two components. Each component converts to the other as it destroys acid (or base). Choice A is incorrect as a buffer is a weak acid and its slightly basic salt (or vice versa).
    Author: rikazzz Comment
    Cardiovascular System
    Which of the following descriptions refers to the “microcirculation”?
    Microcirculation is the exchange of solution between the capillary blood and the cells via the interstitial fluid. It occurs by diffusion.
    Author: rikazzz Comment
    Cardiovascular System
    What may correctly be said about baroreceptors?
    Vasoconstriction and increased contractility promote an increase in BP. Baroreceptors are located in the walls of the carotid sinus and aortic sinus, among other places. Choices B and D are wrong.
    Author: rikazzz Comment
    Chemistry for Physiology
    A solution of glucose is used for an infusion. Over a 3-h period, 250 ml of solution is used containing a total of 5 g of glucose. What is the concentration of the glucose solution used?
    5 g per 250 ml = 20 g per 1000 ml (multiply by 4) = 2 g per 100 ml = 2%.
    Author: rikazzz Comment
    Nervous System
    What is the type of neuroglia that forms the myelin sheath on neurons outside of the CNS?
    Schwann cells surround the axon to form the myelin sheath in peripheral neurones. Oligodendrocytes perform a similar function for neurones in the CNS.
    Author: rikazzz Comment
    Ionising Radiation
    Radiation which is “ionising” includes which of the following?
    The other three choices, while also being forms of electromagnetic radiation, do not utilise energies that are sufficient to remove electrons from their atoms.
    Author: rikazzz Comment
    Gastrointestinal System
    Digestion of food molecules is necessary so that:
    The production of molecules that are small enough to be absorbed into epithelial cells is the purpose of digestion.
    Author: rikazzz Comment
    Skeleton and Joints
    What is the significance of the cribriform plate of the ethmoid bone?
    The plate is a sieve-like structure, due to the many foramina which allow neurons from the olfactory bulb to contact the olfactory membrane in the superior nasal concha. Thus inhaled air can stimulate our sense of smell.
    Author: rikazzz Comment
    Reproductive System
    In which of the following lists are the structures of the male reproductive tract listed in correct order from testes to urethra?
    Seminiferous tubules are in the testes so should be before the epididymis and vas deferens; ejaculatory ducts must be after the vas deferens.
    Author: rikazzz Comment