Negative Feedback: Thyroxin Levels (Grade 12 NSC Matric Life Sciences): Flashcards
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Basal metabolic rate (BMR)
Basal metabolic rate (BMR)
Energy usage rate when body is at rest
Thyroxin
Thyroxin
Hormone controlling metabolic rate
Gland that produces thyroxin
Gland that produces thyroxin
Thyroid gland
Element needed for thyroxin production
Element needed for thyroxin production
Iodine
TSH
TSH
Thyroid-stimulating hormone from pituitary gland
Location of pituitary gland
Location of pituitary gland
Brain
Negative feedback mechanism purpose
Negative feedback mechanism purpose
Maintains thyroxin levels within normal range
Response to low thyroxin levels
Response to low thyroxin levels
Pituitary increases TSH → thyroid makes more thyroxin
Response to high thyroxin levels
Response to high thyroxin levels
Pituitary reduces TSH → thyroid makes less thyroxin
Homeostasis
Homeostasis
Body's ability to keep internal conditions stable