hypothalamic-pituitary thyroid axis

action anatomy anterior axis background biology body brain care control diagram endocrine endocrinology feedback function gland graphic health hormone hormones hpt human hyperthyroidism hypothalamicpituitary hypothalamus illustration infographic inhibition iodine medical medicine negative neuroendocrine neuron organ parathyroid pituitary production releasing science secretion silhouette stimulating structure system throat thyroid trh triiodothyronine tsh vector