Myasthenia gravis is an autoimmune disease in which the immune system gradually destroys the receptors for acetylcholine at the neuromuscular junction. Which of the following drugs might initially be useful in treating the symptoms of this disease?
A. A drug that inhibits release of acetylcholine
B. A drug that inhibits acetylcholinesterase
C. Atropine (a muscarinic acetylcholine receptor antagonist)
D. A nicotinic acetylcholine receptor antagonist
E. Curare
Answer: B
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The sequence of symptoms of heatstroke is
A. intense itching, profuse sweating, kidney failure, racing pulse, headache. B. neurological symptoms, dizziness, skin reddening, and then headache and racing heart. C. headache, dizziness, exhaustion, then sweating, which stops as the skin becomes red, hot, and dry. D. fever, itching, redness, headache, numb extremities, vomiting.
Which of the following statements correctly describes fatty acids?
A) Volatile fatty acids are the longest fatty acids. B) Saturated fatty acids are linear in structure and have one or no double bonds. C) Medium-chain fatty acids are produced by ruminants when cellulose is fermented. D) Double bonds in fatty acids create bends/kinks in the chain, thus altering membrane structure.
What vessel exits the left ventricle?
A. pulmonary trunk B. pulmonary vein C. aorta D. pulmonary artery
On coronal images, the dip of the meningeal layer of the dura mater between the two hemispheres of the cerebellum is identified as the ____________________.
Fill in the blank(s) with the appropriate word(s).