Thyroxine Effects
- Increases Basal Metabolic Rate (BMR) > increased heat production
Hypothyroidism
What Lowers TSH Release (1)
Pituitary (hypophysis) hormone TSH (thyroid stimulating hormone) stimulates thyroid to release thyroxine (T4) and triiodothyronine (T3). T4 and T3, when they reach a certain level, lower release of TSH by negative feedback loop. In low T4/T3 (hypothyroidism) TSH will be high, and in high T4/3 (hyperthyroidism) TSH will be low (1). Other factors that lower TSH level: