Internal secretion mostly discharged in the blood by endocrine glands
Secretion of endocrine glands
Chemical substances secreted into the gut
Inorganic catalysts
A
Internal secretion mostly discharged in the blood by endocrine glands
B
Chemical substances secreted into the gut
C
Secretion of endocrine glands
D
Inorganic catalysts
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Solution
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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.
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