Oxytocin is a hormone that

Question

BlackTom AI · Accepted Answer

To evaluate the statement about oxytocin, I will examine each option one by one and judge its accuracy based on basic physiology.
Option 1: 'Is released from the posterior pituitary gland and stimulates uterine contractions during childbirth.' This combines two correct facts: oxytocin is indeed released from the posterior pituitary, and its action includes stimulating uterine contractions during labor. Both components are true, so this statement is correct in content.
Option 2: 'helps regulate sodium reabsorption in the kidneys.' This describes the action of antidiuretic hormone (vasopressin), not oxytocin. Oxytocin does not play a primary role in sodium reabsorption; therefore this assertion is incorrect and reflects a misunderstanding of hormone specificity.
Option 3: 'stimulates bone growth at the epiphyseal growth plates of long bones.' This is the role of growth hormone (somatotropin) during growth, not oxytocin. Thus, this statement is false and incompatible with oxytocin’s known functions.
Option 4: 'stimulates uterine contractions during childbirth.' This is a true statement about oxytocin’s functional effect. It correctly notes one of its key actions, though it does not specify the source of release; the fact remains accurate about its effect.
Option 5: 'is released from the posterior pituitary gland.' This is a correct factual claim about the origin of oxytocin, but it is incomplete as it does not mention its action. Nevertheless, as a stand-alone fact, it is true.
In summary, options 1, 4, and 5 contain true elements about oxytocin, while options 2 and 3 describe roles belonging to other hormones and are false regarding oxytocin. The distinction hinges on both the source (posterior pituitary) and the primary actions (contractions) of oxytocin, with option 1 capturing the full canonical statement, option 4 capturing a key functional effect, and option 5 confirming the release site albeit without functional detail.

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