Why is it easier to lift an ink pen than it is to lift a 25-lb barbell?
A) It requires fewer motor units to lift the ink pen.
B) It takes more time for muscle tension to exceed the load of a light object than a heavy object.
C) The time for muscle tension to exceed load is not dependent on the mass of an object.
D) It takes less time for muscle tension to exceed the load of a heavy object than a light object.
A
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The difference in hydrogen ion concentration between solutions with pH 4 and pH 5 is
A. tenfold. B. twofold. C. twentyfold. D. fivefold.
Which of the following is not a property of articular cartilage?
A) covered by perichondrium B) lubricated by synovial fluid C) enclosed by an articular capsule D) similar to hyaline cartilage E) smooth, low-friction surface
Once a structure is fully grown and mature, it will probably
A. up-regulate its receptors for growth hormone, as it no longer receives as much of the ligand. B. up-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate. C. down-regulate its receptors for growth hormone, as it no longer receives as much of the ligand. D. down-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate.
What membrane potential must generally be met in order to achieve threshold?
A) -30 mV B) -55 mV C) -85 mV D) -70 mV