Whereas sodium is found mainly in the extracellular fluid, most ________ is found in the intracellular fluid
A) potassium
B) chloride
C) bicarbonate
D) iron
A
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The advantage of cryo-electron tomography is that it
A) enables cells to divide continually. B) preserves intercellular junctions. C) is cheaper than other methods. D) provides a static view of the skin.
A sphygmomanometer measures
A) blood pressure. B) hematocrit. C) brain function. D) clotting time.
Control of the diameter of the respiratory passages depends upon
A) sympathetic stimulation only. B) parasympathetic stimulation only. C) somatomotor stimulation only. D) both parasympathetic and sympathetic levels of stimulation. E) sensory receptors sensitive to changes in lung ventilation.
Myasthenia gravis results from the destruction of acetylcholine receptors at the neuromuscular junction, but treatment involves medications that reduce acetylcholinesterase activity. Which statement best explains the effectiveness of these medications?
A. The antibodies destroy some but not all of the acetylcholine receptors, so reducing acetylcholinesterase activity increases the likelihood that acetylcholine will bind to the remaining receptors. B. The antibodies that destroy the acetylcholine receptors are less likely to work if acetylcholinesterase is present. C. Acetylcholinesterase is the substance that destroys the receptors as well, so reducing its activity increases the number of acetylcholine receptors. D. Acetylcholinesterase breaks down the acetylcholine to a substance that can bind to the damaged receptors.