In an isotonic, concentric contraction,
a. circular muscles (like those in the iris of the eye) contract, making a smaller aperture.
b. muscle length shortens while tension remains constant.
c. muscle lengths shorten, drawing objects closer to the body midline.
d. None of these.
B
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Marissa is an avid marathon runner, and she trains incessantly. She has slimmed down so that she is now underweight for her height and has very little fat tissue. One would expect Marissa to
A) have heavy menstrual flows. B) ovulate continuously. C) be amenorrheic (have no monthly menstrual flow). D) have painful menstrual cramps. E) show elevated levels of FSH.
Catecholamines activate postsynaptic cells by ________.
A. inhibition of adenylate cyclase B. inhibition of calmodulin C. increased production of cyclic AMP D. increased Ca2+ influx into the target cell
Haversian systems or osteons
A. lack concentric lamellae. B. do not contain osteocytes. C. are found in spongy bone tissue. D. are avascular. E. are the basic units in compact bone tissue.
The tapered, conical inferior end of the spinal cord is called the conus
A. caudalis. B. finalis. C. equine. D. sacralis. E. medullaris.