The "negative" intrapleural pressure, when compared to atmospheric pressure, maintains lung inflation
Indicate whether the statement is true or false
T
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Upon testing the knee jerk reflex during a routine physical, a nurse notices that the reflex is hyperactive. What could be the explanation for this? If instead the reflex was hypoactive, what may the nurse conclude?
What will be an ideal response?
Which of the following statements is TRUE?
A. Phosphodiesterase converts GMP into cGMP B. Phosphorylation by protein kinases can stimulate or inhibit the activity of effector proteins. C. Phospholipase C converts ATP to cAMP. D. Ca2+ is not a second messenger. E. Conversion of ATP to cAMP is a phosphorylation reaction.
What part of the heart's conduction system acts as the primary pacemaker?
A. Bundle of His B. Purkinje fibers C. SA node D. AV node
Imagine yourself sitting in an awkward position in an uncomfortable chair that is depriving part of your leg from normal blood flow. This deprivation of adequate perfusion will result in what sort of local changes in your leg?
A. Decreases in carbon dioxide and hydrogen ions will cause vasodilation. B. Buildup of carbon dioxide and hydrogen ions will cause vasoconstriction. C. Buildup of carbon dioxide and hydrogen ions will cause vasodilation. D. Decreases in oxygen and potassium will cause vasoconstriction. E. Increases in oxygen and potassium will cause vasodilation.