calcitonin thyroid hormone

calcitonin thyroid calcium bone gland hormone metabolism absorption vitamin endocrine system anatomy blood kidney regulation thyrocalcitonin vector endocrinologist goiter illustration health function endocrinology medical diagram human thyroxine organ anatomical internal medicine hormonal poster clinic graphic design trh thyrotropin brain hypothalamus pituitary tsh t3 t4 triiodothyronine gut vessel educational healthy