What triggers the release of parathyroid hormone (PTH)?
A) decreasing sodium ion concentration of the blood
B) increasing calcium ion concentration of the blood
C) increasing potassium ion concentration of the blood
D) decreasing calcium ion concentration of the blood
Answer: D
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The time of day most hazardous for heart attacks is ________.
A) morning B) noontime C) evening D) during sleep
This mineral is a cofactor of the carbonic anhydrase enzyme system.
A) chloride B) calcium C) copper D) zinc E) magnesium
Activated complement does not
a. promote localized vasodilation b. formation membrane-attack complexes c. activate kinins d. stimulate interferon production e. stimulate local mast cell activity
This figure illustrates changes in blood pressure when _____ feedback mechanisms are in control
A. positive B. negative