The student nurse learns that the hormone necessary for milk production is
Estrogen.
Prolactin.
Progesterone.
Lactogen.
The Correct Answer is B
The correct answer is choice B. Prolactin.
Choice A reason:
Estrogen. Estrogen is a hormone that plays a role in the development of the mammary glands and the ductal system during pregnancy. However, estrogen does not directly produce milk.
In fact, high levels of estrogen during pregnancy inhibit milk secretion by blocking prolactin. Therefore, estrogen is not the hormone necessary for milk production. • Choice B reason:
Prolactin. Prolactin is the hormone responsible for the production of breast milk. Prolactin is secreted by the pituitary gland in response to suckling or nipple stimulation. Prolactin levels rise during pregnancy and peak after delivery, when the sudden drop in estrogen and progesterone allows prolactin to take over and initiate lactation. Therefore, prolactin is the hormone necessary for milk production. • Choice C reason:
Progesterone. Progesterone is a hormone that also contributes to the development of the mammary glands and the alveoli during pregnancy. However, like estrogen, progesterone does not directly produce milk. Progesterone also inhibits milk secretion by blocking prolactin during pregnancy. Therefore, progesterone is not the hormone necessary for milk production. •
Choice D reason:
Lactogen. Lactogen is not a hormone, but a general term for any substance that stimulates lactation. There are different types of lactogens, such as human placental lactogen (hPL), which is produced by the placenta during pregnancy and has some lactogenic effects on the mammary glands. However, hPL is not the main hormone responsible for milk production. That role belongs to prolactin. Therefore, lactogen is not the hormone necessary for milk production.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason:
Babinski's Reflex is the normal response in infants when the sole of the foot is stroked from the heel to the ball of the foot. The big toe moves upward or toward the top surface of the foot, and the other toes fan out. This reflex is normal in children up to 2 years old, and it disappears as the nervous system matures. It may indicate damage to the central nervous system in older children and adults.
Choice B reason:
Stepping Reflex is the normal response in infants when they are held upright with their feet touching a flat surface. They will lift one foot and then the other, as if they are walking. This reflex is present at birth and lasts for about 2 months. It helps prepare the infant for voluntary walking.
Choice C reason:
Moro Reflex is the normal response in infants when they are startled by a loud noise or a sudden movement. They will extend their arms and legs, open their hands, and then curl up and bring their arms together as if they are hugging themselves. This reflex is present at birth and lasts for about 4 to 6 months. It is thought to be a protective response that helps the infant cling to their caregiver.
Choice D reason:
Plantar Grasp Reflex is the normal response in infants when pressure is applied to the sole of the foot near the toes. The toes will curl down and grasp the stimulus. This reflex is present at birth and lasts for about 9 to 12 months. It is similar to the palmar grasp reflex in the hands, and it helps develop the muscles and nerves in the feet. Some additional sentences are:. If you are interested in learning more about infant development, you can check out some of these links:. • [A guide to newborn reflexes]. • [A video demonstration of newborn reflexes].
Correct Answer is C
Explanation
The correct answer is c. Dehydration. A significantly indented anterior fontanelle in a newborn is most commonly a sign of dehydration.
Choice A reason:
Increased intracranial pressure: This statement is incorrect because increased intracranial pressure typically causes a bulging, not indented, fontanelle. Symptoms include irritability, vomiting, and a high-pitched cry.
Choice B reason:
Vernix caseosa: This statement is incorrect because vernix caseosa is a white, cheesy substance covering the skin of newborns, unrelated to fontanelle indentation. It serves as a protective layer for the baby’s skin.
Choice C reason:
Dehydration: This statement is correct. Dehydration in newborns can cause a sunken fontanelle due to the loss of fluid. Other signs include dry mouth, sunken eyes, and fewer wet diapers.
Choice D reason:
Cyanosis: This statement is incorrect because cyanosis refers to a bluish discoloration of the skin due to lack of oxygen, not related to fontanelle shape. It indicates issues with oxygenation or circulation.
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