Melatonin can pass through plasma membranes since it is derived from the nonpolar amino acid tryptophan.
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Q3: Dual glands,like the pancreas,have both endocrine and
Q4: Endocrine glands secrete their products into ducts.
Q5: The neurons from the hypothalamus secrete chemicals
Q6: Hormones which enhance the responsiveness of a
Q7: Molecules secreted by endocrine glands that are
Q9: Which of the following is the most
Q10: Polypeptide hormones are synthesized from tyrosine and
Q11: When two or more hormones work together
Q12: Most polypeptide and protein hormones are synthesized
Q13: Polypeptide and glycoprotein hormones can be taken
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