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Most of the calcium in the body is in the


A) bones.
B) plasma.
C) kidneys.
D) GI tract.
E) extracellular fluid.

F) C) and E)
G) A) and B)

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Sensible perspiration


A) contains only water.
B) is water lost through simple evaporation.
C) is secreted by the sweat glands.
D) is invisible on the skin.
E) is secreted by salivary glands.

F) C) and D)
G) A) and E)

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As a result of hyperventilation,


A) the body pH decreases.
B) the plasma PCO2 level decreases.
C) the kidney will increase the rate of hydrogen ion excretion.
D) more bicarbonate ions are added to the plasma.
E) the plasma PCO2 level increases.

F) A) and E)
G) A) and D)

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Stimulus for the secretion of parathyroid hormone is a decrease in serum


A) potassium levels.
B) calcium levels.
C) calcitonin levels.
D) phosphate levels.
E) sodium levels.

F) A) and D)
G) A) and E)

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The predominant extracellular cation is


A) bicarbonate.
B) sodium.
C) chloride.
D) potassium.
E) hydrogen ion.

F) A) and B)
G) A) and C)

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Oversecretion of aldosterone causes


A) decreased secretion of calcium by the kidney.
B) increased secretion of potassium by the kidney.
C) decreased reabsorption of sodium by the kidney.
D) increased reabsorption of phosphate ions by the kidney.
E) decreased secretion of potassium by the kidney.

F) A) and B)
G) B) and C)

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A major complication of thyroid surgery is the accidental damaging or removal of the parathyroid glands. This damage or removal of the parathyroid glands can result in


A) increased sodium retention.
B) increased plasma volume.
C) decreased plasma calcium.
D) delayed healing.
E) increased plasma calcium.

F) B) and C)
G) A) and B)

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What is the main role of magnesium ions in the body?


A) muscle contraction
B) nerve impulse
C) blood clotting
D) cofactors for intracellular enzymes

E) A) and C)
F) A) and B)

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