Thyroid hormones MCQ 13+

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• Thyroxin
  ক

  Mostly bounds to plasma protein

  খ

  Increase the carbon dioxide production

  গ

  Increase the basal metabolic rate

  ঘ

  Is synthesized from two molecules of tyrosine and three atoms of iodine

  ঙ

  Accounts for 50% of circulatory thyroid hormones
• Hyposecretion of thyroid hormone leads to
  ক

  Myxoedema

  খ

  Cretinism

  গ

  Tetany

  ঘ

  Osteoporosis

  ঙ

  Exophthalmos
• Thyroid hormone
  ক

  Stimulates lipolysis

  খ

  Has positive chronotropic effects

  গ

  Decrease the rate of carbohydrate absorption

  ঘ

  When decrease produces myxoedema in children

  ঙ

  Essential for epiphygeal closure
• Thyroxin binding globulin TBH level is increased in-
  ক

  Pregnancy

  খ

  Oestrogen therapy

  গ

  Nephritic syndrome

  ঘ

  Androgen therapy

  ঙ

  Chronic active hepatitis
• The physiological effects of thyroid hormones are the following
  ক

  Simulation of formation LDL receptors.

  খ

  Increase in rate of brain development.

  গ

  Simulation of normal brain development.

  ঘ

  Simulation of O2 consumption by anterior pituitary.

  ঙ

  Decrease in protein breakdown in muscle.
• Following are functions of thyroid hormone
  ক

  Increase oxygen consumption

  খ

  Increase growth

  গ

  Affects neurodevelopment

  ঘ

  Decrease protein synthesis

  ঙ

  Decrease metabolism of carbohydrate
• Physiologic effects of thyroid hormones are
  ক

  Increase in number of β adrenergic receptors

  খ

  Simulation of O2 consumption by metabolically active cells

  গ

  Increase in protein breakdown

  ঘ

  Inhibition of lipolysis

  ঙ

  Decreased rate of carbohydrate absorption
• Thyroid hormones
  ক

  Increases protein breakdown

  খ

  Promotes skeletal development

  গ

  Increases carbohydrate absorption in the gut

  ঘ

  Decreases metabolic rate

  ঙ

  Decreases lipolysis
• Thyroxine
  ক

  Is stored as thyroglobulin in the follicles

  খ

  Deficiency in infancy causes mental retardation

  গ

  Deficiency causes anemia

  ঘ

  Decreases the basal metabolic rate

  ঙ

  Acts more rapidly than triiodothyronine
• TSH increases
  ক

  Number of thyroid cells

  খ

  Size of thyroid cells

  গ

  Organification of tyrosine

  ঘ

  Synthesis of thyroglobulin

  ঙ

  Activity of iodide pump
• Anti-microsomal antibody may be positive in
  ক

  Graves’ disease

  খ

  Hashimoto’s thyroiditis

  গ

  Multinodular goitre

  ঘ

  Subacute thyroiditis

  ঙ

  Medullary carcinoma of thyroid