Endocrine glands do not have ducts. What is true of these glands? -They secrete hormones over a membrane into the bloodstream
-They do not produce secretions
-They produce secretions but do not release them
-They secrete hormones into the ducts of exocrine glands.

Endocrine glands secrete hormones over a membrane into the bloodstream.

Explanation:

The endocrine glands are characterized by the secretion of hormones that pass directly into the bloodstream. This is because, unlike the exocrine glands, they do not have ducts.

Hormones leave the endocrine cell through transmembrane transport, to reach the blood capillaries and from there to the general circulation.Once the hormones are released into the bloodstream they bind to specific effector cells, attaching to membrane receptors for these substances.

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