First crystalline hormone is:
Correct answer: A. Thyroxine
- A. Thyroxine
- B. Non_adrenaline
- C. Adrenaline
- D. All of above
Explanation
Thyroxine: Thyroxine was the first hormone to be isolated and crystallized in 1914, making it a significant milestone in endocrinology. This historical fact makes it the correct answer to this question. Non-adrenaline and adrenaline are not crystalline hormones, so they are incorrect choices. The option 'All of above' is also incorrect because not all options listed are correct.
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About Chemical Coordination and Hormones
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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