________ are hormones released by neurons and enter the blood for distribution throughout the body.
A. Exocrine secretions
B. Paracrine signals
C. Neurotransmitters
D. Neuroendocrine secretions
Answer: D
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Indicate whether the statement is true or false
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This figure illustrates the microscopic anatomy of spongy bone. Which is a mature bone cell?
A. 1 B. 2 C. 3 D. 4 E. None of the choices is correct.