User:Z3186755: Difference between revisions

Revision as of 20:04, 18 August 2010

--z3186755 23:42, 28 July 2010 (UTC)

--3186755 23:15, 4 August 2010 (UTC)

--3186755 23:28, 11 August 2010 (UTC)

Lab 2 Questions

1.What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy?

secrete Human Chorionic Gonadotropin (hCG)

2.What does the corpus luteum secrete to prevent continuation of the menstrual cycle?

produces progesterone and estrogen

Lab 3 Questions

1. What Carnegie stages occur during week 3 and week 4?

Week 3: Carnegie Stages 7 - 9, hallmark features that occur during these stages include gastrulation, development of the notohord and placentation

Week 4: Carnegie Stages 10-13, hallmark features include initial development of the heart, pharyngeal arches and placodes

2. What is the change in overall embryo size form the beginning of week 3 to the end of week 4?

Start of week 3 - stage 7: embryo diameter of 0.4mm

End of week 4 - stage 13: embryo diameter between 3-5mm

3. Approximately when do the cranial (anterior) and caudal (posterior) neuropores close in the human embryo?

Stage 11 (aprox 24 days) - cranial neuropore closes within a few hours

Stage 12 (aprox 26 days) - caudal neuropore takes a day to close

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@@ Line 40: / Line 40: @@
 . Approximately when do the cranial (anterior) and caudal (posterior) neuropores close in the human embryo?
+Stage 11 (aprox 24 days) - cranial neuropore closes within a few hours
+Stage 12 (aprox 26 days) - caudal neuropore takes a day to close