Parathyroid hormone MCQ 20+

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• The following influence the secretion of parathormone
  ক

  Vitamin-D

  খ

  Catecholamine

  গ

  Insulin

  ঘ

  Magnesium

  ঙ

  Prolactin
• Parathormone
  ক

  Decreases urinary excretion of calcium

  খ

  Level in the blood increases when serum calcium falls

  গ

  Is independent of magnesium level

  ঘ

  Is produced by the C-cells of the thyroid gland

  ঙ

  Depresses activity of the anterior pituitary
• Physiological functions of parathyroid hormones are
  ক

  Increase in renal tubular Ca2+ reabsorption

  খ

  Increase in intestinal Ca2+ absorption

  গ

  Activation of renal 1α- hydrolase enzyme action

  ঘ

  Simulation of both osteoblastic and osteoclastic activity

  ঙ

  Increase in renal tubular phosphate reabsorption
• The following hormones influences calcium metabolism
  ক

  Insulin

  খ

  Oestrogen

  গ

  Growth hormone

  ঘ

  Prolactin

  ঙ

  Testosterone
• Functions of parathormone are
  ক

  Increase absorption of Ca++ from intestine

  খ

  Decrease phosphate reabsorption from kidney

  গ

  Increase reabsorption of Ca++ from kidney

  ঘ

  Increase reabsorption of Ca++ from bone

  ঙ

  Decrease reabsorption of phosphate from bone
• Hormones responsible for calcium homeostasis are
  ক

  Parathormone

  খ

  Insulin

  গ

  Glococorticoid

  ঘ

  Adrenalin

  ঙ

  Growth hormone
• Plasma calcium level is regulated by
  ক

  Calcitriol

  খ

  Parathyroid hormone

  গ

  Aldosterone

  ঘ

  Glucagon

  ঙ

  Norepinephrine
• Parathyroid hormone
  ক

  Increases renal Ca2+ reabsorption

  খ

  Increases Ca2+ mobilization from bone to ECF

  গ

  Increases intestinal Ca2+ absorption

  ঘ

  Decreases excretion of phosphate

  ঙ

  Decreases intestinal PO4 absorption
• Parathormone increases
  ক

  Calcium resorption from bone

  খ

  Phosphate excretion through kidney

  গ

  Calcium and phosphate absorption from intestine

  ঘ

  Calcium excretion through kidney

  ঙ

  Phosphate deposition in bone
• An increase in plasma parathyroid hormone level would lead to an increase in
  ক

  1α-hydroxylase enzyme activity

  খ

  Number of osteoclast

  গ

  Renal proximal tubular reabsorption of Ca++

  ঘ

  Calcium binding protein

  ঙ

  Ca++ reabsorption in the thick segment of ascending limb of loop of Henle
• Parathyroid hormone directly controls the rate of
  ক

  Formation of 1

  খ

  25-dihydroxycholecalciferol

  গ

  Renal tubular calcium ion reabsorption

  ঘ

  Calcium transport in the mucosa of the small intestine

  ঙ

  25-hydroxycholecalciferol formation

  চ

  Formation of calcium binding protein
• Causes of hypercalcemia are
  ক

  Hyperparathyroidism

  খ

  Prolonged immobilization

  গ

  Lithium overdose

  ঘ

  Lung cancer

  ঙ

  Steroid therapy
• Decrease in ECF Ca++ concentration results in increased
  ক

  Neuromuscular excitability

  খ

  Contractility of cardiac muscle

  গ

  Secretion of parathyroid hormone

  ঘ

  Motility of gastrointestinal tract

  ঙ

  Secretion of calcitonin
• Life saving hormones are
  ক

  Cortisol

  খ

  Thyroxine

  গ

  Testosterone

  ঘ

  FSH

  ঙ

  Growth hormone
• Calcium metabolism is regulated by
  ক

  Calcitriol

  খ

  Parathyroid hormone

  গ

  Calcitonin

  ঘ

  Calmodulin

  ঙ

  Thyroid hormone
• Raised serum calcium level are found in
  ক

  Vitamin-D intoxication

  খ

  Multiple myeloma

  গ

  Vitamin-D deficiency

  ঘ

  Chronic kidney diseases

  ঙ

  Loop diuretics administration
• Causes of hypercalcaemia are
  ক

  Primary hyperparathyroidism

  খ

  Tuberculosis

  গ

  Cushing’s syndrome

  ঘ

  Hypothyroidism

  ঙ

  Vitamin D deficiency
• Laboratory finding/s of primary hyperparathyroidism is/are
  ক

  Hypercalcemia

  খ

  Increased serum parathyroid hormone

  গ

  Increased serum alkaline'phophatase if bone involvement is present

  ঘ

  Hyperphosphatemia

  ঙ

  Decreased urinary phosphate