Which of the following is true regarding endocrine glands?
A. They secrete their products by way of ducts.
B. Their secretions may be released onto the body surface.
C. They have an unusually low density of blood capillaries.
D. They secrete substances that do not alter the metabolism of their target cells, but have extracellular effects.
E. They release their secretions into the blood.
Answer: E
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