Sympathomimetic Drugs and, to a lesser degree, norepinephrine Norepinephrine Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. It stimulates both the alpha- and beta- adrenergic systems, causes systemic vasoconstriction and gastrointestinal relaxation, stimulates the heart, and dilates bronchi and cerebral vessels. Adrenal Glands: Anatomy is the inner portion of the gland, secreting epinephrine Epinephrine The active sympathomimetic hormone from the adrenal medulla. The activity of the adrenal medulla is regulated by the sympathetic nervous system. Derived from ectoderm, adrenal medulla consists mainly of chromaffin cells that produces and stores a number of neurotransmitters, mainly adrenaline (epinephrine) and norepinephrine. The adrenal medulla Adrenal Medulla The inner portion of the adrenal gland. Hormones: Overview and Types and has different regulatory mechanisms. Hormones play critical roles in coordinating cellular activities throughout the body in response to the constant changes in both the internal and external environments. Each of these areas secretes different hormones Hormones Hormones are messenger molecules that are synthesized in one part of the body and move through the bloodstream to exert specific regulatory effects on another part of the body. Adrenal cortex function is regulated by pituitary adrenocorticotropin. It is derived from mesoderm and comprised of three zones (outer zona glomerulosa, middle zona fasciculata, and inner zona reticularis) with each producing various steroids preferentially, such as aldosterone hydrocortisone dehydroepiandrosterone and androstenedione. Adrenal Glands: Anatomy and the adrenal cortex Adrenal Cortex The outer layer of the adrenal gland.

Adrenal Glands: Anatomy, the adrenal medulla Adrenal Medulla The inner portion of the adrenal gland. Beneath the cortex lies the adrenal medulla, which secretes catecholamines involved in the fight-or-flight response. The outer parenchyma is called the adrenal cortex and has 3 distinct zones, each with its own secretory products. There are 2 primary portions of the adrenal glands Adrenal Glands The adrenal glands are a pair of retroperitoneal endocrine glands located above the kidneys.

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Hormones of the adrenal gland