Hormones affect the target cells by:
Correct answer: D. both a & b
- A. Initiating new biochemical reactions
- B. Produce their effect by regulating biochemical reactions
- C. Control long-term changes only
- D. both a & b
Explanation
Hormones influence target cells by binding to receptors and either initiating cellular biochemical responses or regulating reactions already occurring. Thus, both descriptions apply, although hormones do not act on every cell indiscriminately.
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