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Which of the following statements is correct in relation to the endocrine system?

1. Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones.
2. Non-nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones.
3. Releasing and inhibitory hormones are produced by the pituitary gland.
4. Adenohypophysis is under direct neural regulation of the hypothalamus.

Correct answer: Non-nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones.

Solution

Hormones are chemical messengers made in very small amounts that act on target cells elsewhere in the body. The other statements are incorrect because several non-endocrine organs do produce hormones, releasing/inhibitory hormones come from the hypothalamus, and the adenohypophysis is regulated mainly by blood-borne signals, not direct neural input.

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