Why don't hormones build up in the body over time?
A. They do, but target tissues become desensitized over time.
B. They are deactivated or degraded by target cells after hormone-receptor binding.
C. They are filtered out of the blood by lymph tissues.
D. Hormone synthesis is subject to positive feedback regulation.
E. They are secreted from the body by exocrine glands.
Answer: B
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