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Lactation
Practice Quiz

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This is a sample of a quiz on the Resource pages of the Lactation Cases Module similar to that on the Compass quizzes for this module. Print is out and use it to help you study the material. Be sure you know the material in the module BEFORE starting the Compass quiz!


1. In a lactating goat, why would the milk production from one udder half which is milked one time per day be lower than an udder half which is milked twice per day?

  1. the 1X daily milked half has greater overall secretion rate of milk
  2. the 2X daily milked half is taking all the nutrients away from the 1X daily milked half
  3. the 2X daily milked half inhibits milk production of the 1X daily milked half
  4. the 1X daily milked half has a lower overall secretion rate of milk

 

2. Myoepithelial cells can contract in response to which of the following?

  1. oxytocin and vasopressin
  2. prolactin only
  3. vasopressin only
  4. oxytocin and prolactin
  5. acetylcholine only

 

3. Injection of bovine placental lactogen into lactating cows typically affects milk yield by a mechanism somewhat different from bovine somatotropin. What effect would injection of bovine placental lactogen have on milk yield in a mid-lactation dairy cow?

  1. it would decrease milk yield
  2. placental lactogen would inhibit the secretion of growth hormone
  3. placental lactogen does not affect lactation in the cow
  4. it would increase milk yield

 

4. Which of the following best describes the milk ejection reflex?

  1. a reflex with a hormonal pathway
  2. a reflex with a hormonal pathway and a blood borne pathway
  3. mechanical stimulation of the gland
  4. a reflex with a neural pathway and a hormonal pathway

 

5. When is the process of galactopoiesis important in the mammary gland?

  1. during the initiation of lactation
  2. after lactation has been initiated
  3. before lactation has been initiated

 

6. Continuous infusion of cows with oxytocin will have what effect on milk yield?

  1. milk yield will be unchanged
  2. milk yield be decreased
  3. milk yield will be increase

 

7. As milk is secreted from the mammary epithelial cells and accumulates in the alveolar lumen the rate of secretion slows. One of the factors that causes the epithelial cells to slow their rate of milk component secretion is which of the following?

  1. excessive secretion of lactose
  2. pressure buildup in the alveolus leads to locally decreased blood flow
  3. pressure build-up in the lungs
  4. nervous signals from the brain

 

8. Where and in what form is oxytocin stored in the pituitary?

  1. oxytocin is stored in the herring bodies as oxytocin
  2. oxytocin is stored in the hypothalamus as the oxytocin-neurophysin complex
  3. oxytocin is stored in the herring bodies as casein granules
  4. oxytocin is stored in the hypothalamus as neurophysin
  5. oxytocin is stored in the herring bodies as the oxytocin-neurophysin complex

 

9. When changing from 2X per day milking to 3X per day milking of dairy cattle in early lactation there is an increase in milk yield of up to 25%. Approximately one-third of this increase is due to increased overall milk secretion rate. To what is the remainder of the increased production attributed?

  1. increased secretion of FIL
  2. better feeding and management
  3. decreased udder pressure
  4. the increased milk yield only occurs in goats

 

10. The efferent pathway of the milk ejection reflex starts with which of the following?

  1. mechanical stimulation of the teats
  2. release of oxytocin into the blood
  3. nerve impulses reaching the hypothalamus
  4. degradation of oxytocin
  5. synthesis of oxytocin

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