thyroid, and parathyroids glands front and back view on white background

anatomical anatomy back background biology blood body calcium cancer care cartilage chart cross diagram disease endocrine front gland glands glandula health homeostasis hormone human hyperthyroidism hypothyroidism illustration iodine larynx medical medicine neck organ parathyroid parathyroids pharynx schematic science secretion section structure system throat thyreoidea thyroid thyrotropinreleasing trachea treat trh tyrosine vector view white