Biology Forums - Study Force

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.

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(Question 2) 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.

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(Question 3) 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

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(Question 4) 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.

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(Question 5) Calcium balance is influenced by
 
  A. ADH and parathyroid hormone levels.
  B. ADH and aldosterone levels.
  C. parathyroid hormone and vitamin D levels.
  D. aldosterone and parathyroid hormone levels.
  E. insulin and glucagon.

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(Question 6) 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.

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(Question 7) Calcium's roles in the body include
 
  A. bone health.
  B. muscle contraction.
  C. blood clotting.
  D. action potentials in heart muscle.
  E. All of these choices are correct.

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(Question 8) Most of the calcium in the body is in the
 
  A. bones.
  B. plasma.
  C. kidneys.
  D. GI tract.
  E. extracellular fluid.

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(Question 9) In hypocalcemia,
 
  A. depolarization is prevented.
  B. PTH production is reduced.
  C. blood calcium levels are increased.
  D. neuromuscular excitability increases.
  E. neuromuscular excitability decreases.

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(Question 10) Which of the following will the body begin to do in order to compensate for hyperkalemia?
 
  A. vasoconstriction of blood vessels
  B. increase ADH secretion
  C. decrease aldosterone secretion
  D. increase the release of atrial natriuretic hormone
  E. increase aldosterone secretion

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