Which function(s) is/are NOT continuously regulated by the GI tract?
A) motility only
B) absorption only
C) secretion only
D) All 3 functions are regulated.
E) None of the 3 functions are regulated.
B) absorption only
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Smooth muscle responds to action potentials by ______.
A. an all-or-nothing reaction to the action potentials B. a slow contraction in response to a series of action potentials
Which of the following does not influence gas exchange?
A. Concentration of the gases B. Solubility of the gas C. Membrane area and thickness D. All of these influence gas exchange.
The amino acids carried by the transfer RNA are joined by
ionic bonds. covalent bonds. polar bonds. peptide bonds. nonpolar bonds.
When exposed to ultraviolet light, keratinocytes convert a steroid precursor into ________, a molecule that is crucial for regulation of calcium levels
A. calcitriol B. cholecalciferol C. calcitonin D. creatine E. phosphorus