Which of these results from hyperventilation?
A. increased alveolar PCO2 and decreased alveolar PO2
B. an increase in both alveolar PCO2 and PO2
C. decreased alveolar PCO2 and increased alveolar PO2
D. a decrease in both alveolar PCO2 and PO2
E. the same alveolar PCO2 as under normal conditions
C
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In bone, Volkmann's canals function to:
a. Allow fluid flow between bone and cartilage b. Carry longitudinally oriented blood vessels of haversian systems (osteons) c. Form tiny channels that allow communication between one osteocyte and another d. Surround osteoclasts that migrate to the surface of a bone e. Transfer blood between neighboring haversian systems
The molecules that stabilize the cell membrane and prevent it from breaking easily are the:
a. phospholipid molecules b. cholesterol molecules c. protein molecules d. all of the above
Which hormone induces its target cells to take up glucose, thereby lowering blood glucose levels?
A. Pancreatic polypeptide
B. Somatostatin
C. Glucagon
D. Insulin
E. Somatotropin
Clusters of gray matter deep within the brain are called
A. cortices. B. nerves. C. ganglia. D. nuclei.