How to sign: any of the glands of the endocrine system that secrete hormones directly into the bloodstream
Similiar / Same: ductless gland, endocrine
Categories: gland, secreter, secretor, secretory organ
Within this category: adrenal cortex, adrenal gland, adrenal medulla, anterior pituitary, corpus luteum, gonad, islands of Langerhans, parathyroid gland, pars distilis, pars intermedia, pineal gland, pituitary, posterior pituitary, prostate gland, thymus gland, thyroid gland