According to the figure, what is a likely day of implantation?

Question

A.  Day 3

B.  Day 27

C.  Day 13

D.  Day 21

E.  Day 7



Clarify Question

What is the key concept addressed by the question?



What type of thinking is required?





Gather Content

What do you already know about implantation? What other information is related to the question?





Choose Answer

Given what you now know, what information is most likely to produce the correct answer?

 Reflect on Process

Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Answer 1

D.  Day 21

Clarify Question
What is the key concept addressed by the question?
     · This question is asking you to identify the hormonal levels that characterize implantation.

What type of thinking is required?
     · Apply level:
       o You are being asked to take what you already know and use, or apply, it to the conditions that occur with implantation.


Gather Content
What do you already know about implantation? What other information is related to the question?
     · FSH stimulation causes a follicle to finish the maturation process in the early portion of the cycle.
     · Increasing estradiol promotes a sudden spike in LH secretion, which in turn promotes ovulation during the mid point of the cycle. At this point the egg can be fertilized.
     · The corpus luteum, which secretes progesterone and estradiol, finishes maturation at midcycle.
     · Higher levels of estradiol and progesterone from the corpus luteum inhibit further secretion of FSH and LH.
     · Estradiol and progesterone are secreted in the last half of a human female’s menstrual cycle to prepare the lining of the uterus for implantation.
     · For humans, implantation occurs approximately 5-10 days after fertilization.
     · A decline in estradiol and progesterone triggers menstruation.


Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
     · Days 3, 7, and 13 are too early for implantation. On day 3, the shedding of the uterine lining is still underway. Day 7 lining would not be thick enough for implantation, nor would it be on day 13.  Additionally, day 13, as is true for days 3 and 7, is before ovulation, so implantation would not be possible.
     · Day 27 is immediately before menstruation, and the endometrium is not thick enough for implantation.
     · On day 21, the lining is at its thickest, ovulation has occurred a week or so previously, and implantation would be very possible.
 Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
     · Apply level:
       o Answering this question correctly depended on your ability to use implantation in a new situation. If you got an incorrect answer, did you remember that implantation occurs 5-10 days after fertilization, or that the endometrium must be thick enough or implantation cannot occur? Did you have trouble extending the concept of implantation to determine the correct answer?