Thymus and/or Thyroid -includes the principal glands of metabolic control -includes hormones critically involved with blood calcium homeostasis -includes a gland responsible for immune maturation Pancreas and/or Adrenals -glands that produce hormones of sympathetically dominant states -glands that produce hormones of blood glucose regulation -production site for hormones involved with hydration status -production site for hormones involved with blood pressure regulation -includes glands associated with both acute and chronic stress Gonads -glands involved in the production of reproductive hormones