Answer to Question 1
B
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If nerve gas exposure is expected, patients who may have been exposed are given intramuscular injections of atropine (to temporarily block cholinergic activity and to activate acetylcholine sites in the central nervous system) and pralidoxime (to free up the acetylcholinesteras e to start breaking down acetylcholine). An auto-injection is provided to military personnel who may be at risk. The injector is used to give atropine and then pralidoxime. The injections are repeated in 15 minutes. If symptoms of nerve gas exposure exist after an additional 15 minutes, the injections are repeated. If symptoms still persist after a third set of injections, medical help should be sought. Pyridostigmine, neostigmine, and rivastigmine are not used in nerve gas exposure.
Answer to Question 2
C
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Alpha1-adrenergic blockers block postsynaptic alpha1-adrenergic receptors, which results in a dilation of arterioles and veins and a relaxation of sympathetic effects on the bladder and urinary tract. This action makes these drugs useful in the treatment of BPH. BPH is characterized by obstructed urine flow as the enlarged prostate gland presses on the urethra. Alpha1-blocking agents can decrease urinary retention and improve urine flow by relaxing muscles in the prostate and urinary bladder. Options A, B, and D are not correct.
On March 25, 1911, as scores of young factory girls leaped to their deaths from the eighth, ninth, a
Electrical charge of the inner and outer regions of nerve cells
First-order sensory neuron with encapsulated nerve endings
Brain nerve and hearing
Estimated number of new HIV infections per year over time period in Canada
As a nerve impulse arrives at the synapse, it triggers the release of a chemical neurotransmitter fr