Which hormone is responsible for milk production after the birth of the placenta?
a. Pitocin
b. Prolactin
c. Estrogen
d. Progesterone
ANS: B
During pregnancy, high levels of estrogen and progesterone produced by the placenta stimulate growth of the alveoli and ductal system to prepare them for lactation. Prolactin secretion by the anterior pituitary gland stimulates milk production during pregnancy, but this effect is inhibited by estrogen and progesterone produced by the placenta. Inhibiting effects of estrogen and progesterone stop when the placenta is expelled after birth, and active milk production occurs in response to the infant's suckling while breastfeeding. Pitocin is the hormone that causes the let-down reflex during breastfeeding.
You might also like to view...
A critically ill patient has developed septic shock. What pattern of hemodynamic values does the nurse expect to find?
A) Low preload, high afterload, low cardiac index, tachycardia B) Low preload and afterload, high cardiac index, tachycardia C) High preload and afterload, low cardiac index, tachycardia D) Normal preload, low afterload, normal cardiac index, bradycardia
When teaching a 48-year-old patient about the risk factors for hypertension, the nurse would identify a modifiable risk factor as:
1. weight. 2. gender. 3. age. 4. family history.
Which of the following is NOT a drop factor for macrodrip tubing?
A. 60 gtt/mL. B. 20 gtt/mL. C. 15 gtt/mL. D. 10 gtt/mL.
A nurse volunteered to work at a natural disaster site. Which of the following questions should the nurse ask to determine if the 26-year-old individual being screened is depressed or has suicide ideation?
a. Tell me about your pets. b. What do you do for work? How has your work been affected by this disaster? c. Have you thought of harming yourself? d. Have you seen your friends since the disaster?