thyroid hormones. human endocrine system

action anatomical anatomy anterior axis biology body calcitonin calcium care control diagram disorder endocrine feedback function gland health healthcare hormone hormones human hypothalamic hypothalamus illustration inhibition iodine medical medicine negative neuroendocrine neuron organ parathyroid pituitary production regulation releasing science secretion stimulating system thyroid thyroxine trh triiodothyronine tsh tyrosine vector