33. Which of the following about endocrine system is incorrect?
(A) Testis is a part of endocrine system.
(B) T3 and T4 are hormones derived from tyrosine.
(C) The alpha cells of pancreas produce glucagon to increase the blood glucose level.
(D) The heart is an endocrine organ because the cardiac cells produce atrial natriuretic peptide in response to high blood pressure.
(E) Estrogen is a water-soluble hormone that regulates the female reproductive system and sex characteristics.

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