Small, wandering cells that engulf cell debris and pathogens in the CNS are called
A) astrocytes.
B) satellite cells.
C) oligodendrocytes.
D) microglia.
E) ependymal cells.
Answer: D
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Clenching the fingers to make a fist, then relaxing and straightening them, is an example of __________ followed by __________
A. flexion; extension B. extension; flexion C. adduction; abduction D. abduction; adduction E. extension; hyperextension
The __________ are considered the opening from the oral cavity to the oropharynx
A. fauces B. choana C. conchae D. fossae E. glossus
Vasopressin
a. can completely halt urine production during periods of water deprivation to conserve water for the body b. activates the cyclic AMP second-messenger system within the tubular cells c. renders the distal and collecting tubules impermeable to water d. increases Na+ reabsorption by the distal portions of the nephron e. stimulates cells of the ascending limb of the loop of Henle to establish the medullary vertical osmotic gradient
During hyperventilation, why do some people detect a tingling sensation in their hands and feet?
A) a decrease in carbon dioxide in blood B) an increase in carbon dioxide in blood C) widespread release of catecholamines D) hyperexcitability of afferent neurons E) a decrease in blood flow to the distal extremities