Which Statement Regarding Chemical Signaling Systems Is False

question 49

Multiple Choice

Which statement regarding chemical signaling systems is false?

• A) Autocrine signals have an effect on the cells that secrete them.
• B) Paracrine signals have an effect on nearby cells.
• C) Signals carried by the circulatory system come primarily from the environment outside the organism.
• D) A cell must have a receptor for a signal in order to bind to the signal.
• E) A cell without a receptor for a signal is not a target cell for that signal.

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