Which of the following is NOT an action of parathyroid hormone?
A. Decreases the release of phosphate from bone.
B. Stimulates osteoclast activity resulting in the release of calcium.
C. Stimulates increased reabsorption of calcium in the kidneys.
D. Stimulates absorption of calcium from the small intestine.
E. Increases enzymatic formation of active vitamin D.
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Question 2) Overall, PTH (parathyroid hormone) _____ blood phosphate levels.
A. increases
B. decreases
C. elevates
D. enhances
E. has no effect on
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Question 3) Julie was diagnosed with an aggressive tumor of the thyroid. Surgery was performed to remove the thyroid.
However, post-operatively, Julie's blood calcium levels began declining to life-threatening levels. This decline is most likely due to
A. thyroid hormone replacement therapy after the surgery.
B. damage to the anterior pituitary during surgery.
C. accidental removal of the parathyroid glands during surgery.
D. improper laboratory handling of blood samples.
E. post-traumatic stress disorder.
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Question 4) Increased metabolic activity and weight loss are associated with
A. lack of iodine in the diet.
B. hyperthyroidism.
C. too little TSH.
D. cretinism.
E. hypothyroidism.
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Question 5) The rate of secretion of parathyroid hormone increases when
A. serum calcium levels increase.
B. serum calcium levels decrease.
C. serum levels of TSH decrease.
D. serum levels of TSH increase.
E. serum levels of sodium levels increase.
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Question 6) Which of the following characteristics is associated with hyposecretion of thyroid hormones?
A. weight gain
B. exophthalmos
C. warm, flushed skin
D. increased heart rate
E. weight loss
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Question 7) Which of the following is a target tissue for parathyroid hormone?
A. thyroid
B. blood
C. pancreas
D. small intestine
E. stomach
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Question 8) Which of the following is involved in the regulation of thyroid hormone levels?
A. thyroglobulin in thyroid follicles
B. thyroid-stimulating hormone from the anterior pituitary
C. positive feedback mechanisms
D. parathyroid hormone levels
E. blood calcium levels
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Question 9) In the blood,
A. most T3 and T4 molecules are found bound to thyroxine-binding globulin (TBG).
B. T3 and T4 are rapidly metabolized.
C. T3 is converted into T4.
D. T3 but not T4 is bound to TSH.
E. most thyroid hormones are transported in a free form.
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Question 10) Thyroid hormone interacts with its target tissue by
A. using the intracellular mediator system.
B. binding to a membrane bound receptor.
C. increasing iodine uptake in the target cells.
D. releasing thyroglobulin.
E. binding to receptor molecules in the nucleus.
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