Thyroxin (negative feedback) (Edexcel GCSE Biology): Flashcards
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Gland that produces thyroxine
Gland that produces thyroxine
Thyroid gland
Main role of thyroxine hormone
Main role of thyroxine hormone
Controls metabolic rate
Definition of metabolic rate
Definition of metabolic rate
Speed at which chemical reactions occur in body
Other role of thyroxine besides metabolic rate
Other role of thyroxine besides metabolic rate
Supports growth and development
Process that regulates thyroxine levels
Process that regulates thyroxine levels
Negative feedback
Brain structure that detects thyroxine levels
Brain structure that detects thyroxine levels
Hypothalamus
Hormone released by hypothalamus (abbreviation)
Hormone released by hypothalamus (abbreviation)
TRH (thyrotropin-releasing hormone)
Hormone released by pituitary gland (abbreviation)
Hormone released by pituitary gland (abbreviation)
TSH (thyroid-stimulating hormone)
Location of thyroid gland in body
Location of thyroid gland in body
Neck
Effect of high thyroxine on TRH & TSH production
Effect of high thyroxine on TRH & TSH production
Inhibits/stops production
Sequence: low thyroxine triggers release of
Sequence: low thyroxine triggers release of
TRH, then TSH, then more thyroxine
Why underactive thyroid causes weight gain
Why underactive thyroid causes weight gain
Less thyroxine → lower metabolic rate → fat storage