A simple face mask running at 10 to 12 liters per minute will supply which of the following oxygen concentrations?
A) 60 to 90 percent B) 80 to 100 percent C) 40 to 50 percent D) 50 to 65 percent
C
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The capillary "washout" phase occurs when:
A) anaerobic metabolism causes the postcapillary sphincters to remain constricted, causing capillary fluid engorgement. B) postcapillary sphincters relax, releasing accumulated hydrogen, potassium, carbon dioxide, and thrombosed red blood cells. C) cellular ischemia causes the postcapillary sphincters to remain constricted, causing the capillaries to become engorged with fluid. D) precapillary sphincters constrict in response to the buildup of lactic acid, vasomotor failure, and increased carbon dioxide.
+20 mV is the
A) transmembrane potential at the conclusion of phase 0 of the action potential. B) transmembrane potential at the conclusion of phase 3 of the action potential. C) resting transmembrane potential. D) transmembrane potential at the beginning of cardiac rest.