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adrenal adrenaline anatomical anatomy anterior biology body brain cardiovascular care chart denum diagram drawing editable education element endocrine estrogen fertility function gland glands health heart homeostasis hormonal hormone hormones human hypothalamic hypothalamus icon icons illustration internal kidney liver man medical medicine organ organs ovary ovulation oxytocin pancreas parathyroid physiology pineal pituitary posterior reproductive scalable science secretion set small stomach structure symbol sympathetic system testes testicle thymus thyroid tissue vector