Thyroxin (negative feedback) (Edexcel GCSE Biology Combined Science): Flashcards
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Gland that produces thyroxine
Gland that produces thyroxine
Thyroid gland
What thyroxine controls
What thyroxine controls
Metabolic rate
Metabolic rate definition
Metabolic rate definition
Speed of chemical reactions in body
Brain structure that detects thyroxine levels
Brain structure that detects thyroxine levels
Hypothalamus
Hormone released by hypothalamus
Hormone released by hypothalamus
TRH (thyrotropin-releasing hormone)
What TRH causes pituitary to release
What TRH causes pituitary to release
TSH (thyroid-stimulating hormone)
Effect of TSH on thyroid gland
Effect of TSH on thyroid gland
Stimulates production of thyroxine
Effect of high thyroxine on TSH & TRH
Effect of high thyroxine on TSH & TRH
Inhibits/stops their production
Mechanism regulating thyroxine levels
Mechanism regulating thyroxine levels
Negative feedback
Effect of underactive thyroid gland
Effect of underactive thyroid gland
Weight gain (lower metabolic rate)