McqMate
Chapters
| 101. |
Contraction of skeletal muscle is initiated by Ca++ binding to: |
| A. | tropomyosin |
| B. | myosin |
| C. | actin |
| D. | troponin C |
| E. | troponin I |
| Answer» D. troponin C | |
| 102. |
The stretch reflex in skeletal muscle: |
| A. | is a feedback reflex aimed at maintaining muscle length |
| B. | is a polysynaptic reflex |
| C. | maintains muscle strength at various levels of muscle strength |
| D. | is not elicited in the knee jerk which occurs after tapping |
| E. | none of the above are true |
| Answer» A. is a feedback reflex aimed at maintaining muscle length | |
| 103. |
Excitary amino acids in the brain are: |
| A. | glutamate and GABA |
| B. | GABA and glycine |
| C. | glutamate and glycine |
| D. | glycine and aspartate |
| E. | glutamate and aspartate |
| Answer» E. glutamate and aspartate | |
| 104. |
The opioid δ receptor is involved in: |
| A. | analgesia |
| B. | respiratory depression |
| C. | miosis |
| D. | dependence |
| E. | all of the above |
| Answer» A. analgesia | |
| 105. |
With regard to contraction and relaxation of skeletal muscle, all of the following are true EXCEPT: |
| A. | contraction involves the release of K+ from the terminal cisterns |
| B. | relaxation involves the release of Ca2+ from troponin |
| C. | prior to contraction, increase Na+ and K+ conduction occurs in the end-plate membrane |
| D. | relaxation involves cessation of the interaction between actin and myosin |
| E. | contraction involves inward spread of depolarisation along T tubules |
| Answer» A. contraction involves the release of K+ from the terminal cisterns | |
| 106. |
Regarding nerve fibres: |
| A. | type C myelinated fibres in the dorsal root conduct impulses concerning pain and temperature |
| B. | type A α unmyelinated fibres conduct impulses concerning proprioception |
| C. | type A β unmyelinated fibres conduct impulses concerning light touch |
| D. | type A γ unmyelinated fibres conduct impulses to muscle spindles |
| E. | type B myelinated fibres are located in preganglionic autonomic region |
| Answer» E. type B myelinated fibres are located in preganglionic autonomic region | |
| 107. |
With regard to chemoreceptors, all of the following are true EXCEPT: |
| A. | the medullary chemoreceptors respond to a change in blood pCO2 |
| B. | the medullary chemoreceptors respond to blood (H+) |
| C. | the predominant peripheral chemoreceptors are located in the carotid and aortic bodies |
| D. | the peripheral chemoreceptors respond to pO2 |
| E. | the peripheral chemoreceptors respond to blood (H+) |
| Answer» B. the medullary chemoreceptors respond to blood (H+) | |
| 108. |
In the autonomic nerve system, β antagonism results in: |
| A. | constriction of the renal vasculature |
| B. | decreased velocity of conduction in the atrioventricular node |
| C. | decreased velocity of conduction in the HIS/Purkinje system |
| D. | decreased ventricular contractility |
| E. | increased insulin and glucagon secretion |
| Answer» E. increased insulin and glucagon secretion | |
| 109. |
The reticular activating system: |
| A. | has depressed conduction during anaesthesia |
| B. | is located in the pons |
| C. | is a simple collection of parallel nerve fibres |
| D. | has no input from the cranial nerves |
| E. | is electrically isolated from the cerebral cortex |
| Answer» A. has depressed conduction during anaesthesia | |
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