The thin sheet of lubricant that is secreted between serous membrane layers is referred to as ________.
Fill in the blank(s) with the appropriate word(s).
transudate
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Oppositely charged ions in solution are prevented from combining by
A) heat capacity of water. B) hydration spheres. C) water's nonpolar nature. D) free radicals. E) hydrogen bonding.
Cyclic AMP (cAMP) is:
1.a hormone. 2.an enzyme. 3.a second-messenger. 4.a neurotransmitter. 5.an ion.
Premature infants are at risk of infant respiratory distress syndrome because of lack of
A. respiratory muscle strength (e.g., of the diaphragm). B. serous fluid between the pleurae. C. functional respiratory membrane cilia. D. surfactant, a lipoprotein secreted in alveoli. E. fluid clearance from airways.
Which one of the following bones does NOT contain paranasal sinuses?
A) frontal B) sphenoid C) mandible D) ethmoid E) maxilla