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9 Cards in this Set
- Front
- Back
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What do thyroid hormones do?
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Iodine-containing hormones that control the bodies metabolic rate
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Where is T3 created?
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Follicles of the Thyroid
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Where is T4 created?
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Formed in target tissues from conversion of T3
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What are the 4 functions of the Thyroid hormones (4 B's)?
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Bone growth
Brain (CNS) maturation increase B1 receptors of the heart (increase CO, HR, SV, contractility) increase in BMR (inc in glycogenolysis, gluconeogenesis, lipolysis) |
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Which hormone stimulates TSH?
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TRH
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What binds most of the T3/T4 in the blood?
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Thyroxine-binding globulin
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What provides negative feedback to the anterior pituitary to decrease sensitivity to TRH?
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Free T3
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Which binds with more affinity, T3 or T4?
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T3
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What is the Wolff-Chaikoff effect?
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Excess iodine temporarily inhibits thyroid peroxidase = decrease iodine organification = decrease T3/T4 production
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