PATHOLOGY MCQ
ENDOCRINE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In a lactating mammal, the two hormones that promote milk synthesis and milk release, respectively, are ____
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prolactin and calcitonin.
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prolactin and oxytocin.
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follicle-stimulating hormone and luteinizing hormone.
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luteinizing hormone and oxytocin.
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Explanation:
Detailed explanation-1: -During lactation, prolactin promotes milk synthesis and oxytocin stimulates milk ejection.
Detailed explanation-2: -Oxytocin then stimulates prolactin secretion, creating a positive feedback loop. Once a threshold of prolactin is reached, prolactin stimulates dopamine release triggering the dopamine-prolactin negative feedback loop.
Detailed explanation-3: -Prolactin is synthesized by lactotrophs in the anterior pituitary gland. The number of lactotrophs will increase during pregnancy in response to the physiological need to develop breast tissues and to prepare for milk production.
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