The adrenal glands sit on top of the kidneys and secrete the hormones adrenaline and cortisol into the bloodstream. The glands function to help the body deal with stresses. The adrenal glands are

Endocrine glands release hormones directly into the bloodstream. Since the adrenal glands secrete adrenaline and cortisol into the blood, they are endocrine glands. Exocrine glands release substances through ducts, while sebaceous and thymus glands are not the correct classification here.

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