51. An increase in parathyroid hormone levels results in A. : 1380648.
51. An increase in parathyroid hormone levels results in
A. increased rate of bone resorption.
B. increased rate of vitamin D degradation.
C. increased concentration of potassium ions in the urine.
D. increased rate of calcium ion excretion by the kidneys.
E. decreased levels of blood calcium.
52. Adequate calcium absorption from the GI tract depends on
A. serum K levels.
B. serum calcitonin levels.
C. adequate amounts of vitamin D.
D. the osmolality of the extracellular fluid.
E. adequate amounts of vitamin C.
53. 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.
54. Parathyroid hormone effects the
A. bones, heart, and blood.
B. kidney, liver, and spleen.
C. intestine, kidneys, and bone.
D. liver, stomach, and small intestine.
E. stomach, pancreas, and bone.
55. 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
56. The main regulator of serum phosphate levels is a transport process in the
A. liver.
B. kidneys.
C. pancreas.
D. small intestine.
E. large intestine.
57. 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.
58. Calcitonin
A. promotes the absorption of calcium from the gastrointestinal tract.
B. promotes osteoclast activity in the bones.
C. reduces calcium excretion by the kidneys.
D. reduces extracellular calcium ion levels.
E. increases blood calcium levels.
59. Increased osmolality of the ECF
A. increases thirst.
B. inhibits ADH.
C. increases renin secretion.
D. increases aldosterone secretion.
E. decreases thirst.
60. The sensation of thirst results from
A. an increase in the plasma volume.
B. hypertension (increased blood pressure).
C. stimulation of osmoreceptor cells in the hypothalamus.
D. a decrease in the osmolality of the extracellular fluid.
E. stimulation of baroreceptors.
51. An increase in parathyroid hormone levels results in A. : 1380648
