User:Z3265772: Difference between revisions
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===Lab 3 Questions=== | ===Lab 3 Questions=== | ||
1. What Carnegie stages occur during week 3 and week 4? | 1. What Carnegie stages occur during week 3 and week 4? | ||
Revision as of 18:53, 17 August 2010
Group 2
Attendance
--z3265772 23:43, 28 July 2010 (UTC)
--z3265772 22:57, 4 August 2010 (UTC)
--z3265772 23:14, 11 August 2010 (UTC)
Lab Questions
Lab 2 Questions
1. What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy?
Syncytiotrophoblasts secrete Human Chorionic Gonadotropin (hCG) hormone, which prevents degeneration of the corpus luteum
2. What does the corpus luteum secrete to prevent continuation of the menstrual cycle?
Progesterone, which helps make the endometrial lining ready for implantation if an egg is fertilized. Progesterone also changes the endometrium to a secretory lining (from proliferative), which creates an ideal environment for the blastocyst.
Lab 3 Questions
1. What Carnegie stages occur during week 3 and week 4?
Carnegie stages 7 (gastrulation and notochord formation) to 13 (Somite no. 21-29, caudal neuropore closes)
2. What is the change in overall embryo size form the beginning of week 3 to the end of week 4?
embryo has grown 2.6mm to 4.6mm. (week 4. 3mm to 5mm - week 3. 0.4mm)
3. Approximately when do the cranial (anterior) and caudal (posterior) neuropores close in the human embryo?
Cranial neuropore closes at carnegie stage 11, which is 23-26 days
Caudal neuropore closes at carnegie stage 12-13, which is 26-30 days
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