Endocrine glands:

A. Possess ducts to secrete their products into the bloodstream or into interstitial fluid.
B. Lack ducts and secrete their products onto the skin surface.
C. Lack ducts and secrete their products into the bloodstream or into interstitial fluid.
D. Possess short ducts and secrete their products directly onto the skin surface.
E. Secrete mucus directly into a body cavity.

Endocrine glands lack ducts and secrete their products, which are hormones, directly into the bloodstream or the interstitial fluid. This contrasts with exocrine glands, which secrete their products via ducts that lead to the exterior of the body.

Explanation:

Endocrine glands are a part of the endocrine system which include glands such as the pituitary, thyroid, parathyroid, adrenal, and pineal glands. These glands lack ducts and secrete their hormones directly into the surrounding fluid, which is usually the bloodstream or the interstitial fluid. This interstitial fluid and the blood vessels then transport these hormones throughout the body. In comparison, exocrine glands such as sebaceous and sweat glands, release their secretions via ducts that lead to the exterior of the body or into body cavities, not into the bloodstream. For instance, sweat produced by sweat glands is released into ducts that carry sweat to the surface of the skin. Pancreas is an example of a gland that performs both functions, containing cells for digestion and cells that secrete the hormones such as insulin and glucagon into the bloodstream.

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