MCQs Week 18 Loading... 1. Regarding nerve cells The cell body is always located at the dendritic zoneSchwann cells send off multiple processes that form myelin on many neighbouring axonsThey have a high threshold for excitationOligodendrocytes produce myelin in the CNS Loading... 2. Which anaesthetic agent has a primary action that is determined by it's redistribution rather than by it's metabolism? SevofluraneThiopentonePropofolNitrous Oxide Loading... 3. The ophthalmic division of the trigeminal nerve Enters the face via the inferior orbital fissureSupplies sympathetic fibres to constrictor papillae musclesSupplies sensation to the forehead and upper eyelid, excluding the scalpCan be assessed by testing the corneal reflex Loading... 4. Dermatomyositis Affects distal muscles firstCauses a lupus-type facial rashIs associated with visceral cancersCauses dysphagia in the majority of patients Loading... 5. With regard to cardiac muscle Despite an abundant blood supply mitochondria are infrequentNormally over 10% of the total energy liberated is provided by anaerobic metabolismUnder basal conditions the heart's caloric needs are predominantly met by carbohydratesMyoglobin has a role in oxygen storage Loading... 6. Which of the following is a potential adverse effect of propofol? Chest wall rigidityBradycardiaPost-operative nausea and vomitingRaised intra-ocular pressure Loading... 7. Which of the following statements regarding muscle contraction and relaxation is correct? ATP provides the energy for contraction, relaxation is passiveATP provides the energy for relaxation, contraction is passiveATP provides the energy for both contraction and relaxationATP provides the energy for contraction, GPT provides the energy for relaxation Loading... 8. Regarding the non-depolarising muscle relaxants Pancuronium is predominantly renally eliminatedRocuronium undergoes Hoffman degradationVecuronium is in pregnancy category AAtracurium is eliminated by plasma pseudocholinesterase Loading... 9. Which of the following is INCORRECT regarding the trigeminal nerve? Has no motor fibresGives rise to the mental nerveThe maxillary division traverses the foramen rotundumGives rise to the infraorbital nerve Loading... 10. Regarding osteoporosis Increased PTH levels have a major role in the development of senile osteoporosisMarginal to insufficient intake of Vit D is ascribed a significant role in the development of senile osteoporosis. Pathological fractures in osteoporotic bone are due to decreased mineralisation of otherwise normal amounts of osteoid.Interleukin-1 is a potent stimulator of osteoclast activity and is stimulated by decreased oestrogen levels Loading... 11. The otic ganglion Carries sympathetic fibres to dilator pupillaeCarries parasympathetic fibres to the lacrimal glandCarries sympathetic fibres to the parotid glandCarries sympathetic fibres to the submandibular gland Loading... 12. Which anaesthetic agent progresses from phase 1 to phase 2 blockade with increasing concentration? SuxamethoniumRocuroniumAtracuriumVecuronium Loading... 13. Regarding mammalian nerves Unmyelinated fibres are most susceptible to pressureUnmyelinated fibres are least susceptible to local anaestheticsUnmyelinated fibres are least susceptible to hypoxiaUnmyelinated fibres are involved in motor supply to muscle spindles Loading... 14. Diazepam Is less lipid soluble than lorazepamBinds sparingly to plasma proteinsUndergoes microsomal oxidation in the kidneyIs mainly metabolised to desmethyldiazepam Loading...
