Internal secretion mostly discharged in the blood by endocrine glands
B
Secretion of endocrine glands
C
Chemical substances secreted into the gut
D
Inorganic catalysts
Medium
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Updated on : 2022-09-05
Solution
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Correct option is A)
Hormones are special chemical messengers in the body that are created in the endocrine glands like Thyroid gland produces thyroxine and calcitonin.
Hormones are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions. Thus, the correct answer is option A.