MCAT Biology Question 73: Answer and Explanation
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Question: 73
13. Oxytocin and antidiuretic hormone are:
- A. peptide hormones produced and released by the pituitary.
- B. steroid hormones produced and released by the pituitary.
- C. peptide hormones produced by the hypothalamus and released by the pituitary.
- D. steroid hormones produced by the hypothalamus and released by the pituitary.
Correct Answer: C
Explanation:
Both oxytocin and vasopressin (another name for antidiuretic hormone) end with the suffix –in; this should hint that they are peptide or amino acid-derivative hormones. These two hormones are both synthesized by the hypothalamus, but released by the posterior pituitary. Remember that the posterior pituitary does not actually synthesize any hormones itself; rather, it contains the axons of cells originating in the hypothalamus and is the site of release for these hormones.