The lining of the alveolus is coated with an oily secretion called ____________________.
A. surfactant
B. mucus
C. saliva
D. membrane
E. none of the choices are correct.
Answer: A. surfactant
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Vasoconstriction is a reduction in the lumen diameter of a blood vessel due to smooth muscle contraction. Vasodilation is a widening of the lumen due to smooth muscle relaxation. Both are regulated by vasomotor nerve fibers of the sympathetic division of the autonomic nervous system.
What will be an ideal response?
Summarize how the countercurrent multiplier system produces concentrated urine in juxtamedullary nephrons
What will be an ideal response?
The sensitivity of the muscle spindle is maintained by ________
A) anulospiral endings B) secondary afferent (group II) fibers C) alpha motor neurons D) a stretch reflex E) gamma motor neurons
Which statement regarding inflammation is false?
A. Inflammation causes redness. B. Inflammation causes swelling. C. Inflammation causes a cool feeling to the injured area. D. Inflammation causes pain.