A motor unit within the powerful quadriceps muscle would
A. contain several motor neurons.
B. be much like those in the eye muscles.
C. generally contain less than ten fibers.
D. generally contain several hundred fibers.
D
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Which vertebral level does the transumbilical plane pass through?
A) T10 B) T12 C) L3/L4 disc D) L5/S1 disc E) at the level of the sacral promontory
The internal (intracellular) receptor for steroid hormones acts as a transcription factor. Therefore, the cellular response to a steroid would be expected to include
a. an increase in mRNA produced from specific genes. b. an increase in protein production, representing specific gene products. c. both of these. d. neither of these.
In emphysema,
the number of alveoli is reduced. cartilage rings in the trachea break down. the diaphragm is paralyzed. the epiglottis becomes less mobile.
Which of the following is NOT true of cones?
A. Cones are responsible for sharp vision. B. Cones are much more numerous than rods in the peripheral portions of the retina. C. Only cones are found in the fovea centralis. D. They provide for color vision. E. All of these are true of cones.