The skull contains ________ bones
A) 32
B) 22
C) 42
D) 12
E) 27
B
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Which of the following is not a function of astrocytes?
A) They create a three dimensional framework for the CNS. B) They maintain the blood-brain barrier. C) They guide neuron development. D) They rebuild injured neurons. E) They adjust the composition of the interstitial tissue.
Bundles of nerve fibers (neuron processes) running through the CNS are called ________, whereas in the PNS they are called ________.
Fill in the blanks with correct words.
When blood calcium levels rise above normal, osteoclast activity is inhibited by the hormone ___.
Which of the following makes it possible for even a small quantity of hormone to have a strong effect on its target cell?
A) The antagonistic effect B) Enzyme amplification C) Up-regulation D) Down-regulation E) Negative feedback inhibition