The thyroid sets your metabolic rate, kept in check by a feedback loop with the brain. See the normal loop, then what happens when the thyroid does too little or too much.
Normal axis
The thyroid axismetabolism control
TSH
T₃ / T₄
📷 Reference image
A real labeled figure to compare with the interactive above.
The Thyroid Axis — OpenStax, CC BY 3.0 (via Wikimedia Commons)
