User:Z3254753

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Attendance

--z3254753 00:51, 5 August 2010 (UTC)

--z3254753 23:14, 11 August 2010 (UTC)

--z3254753 23:10, 18 August 2010 (UTC)

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Cell Division

external link SMH

fertilisation from homepage

picture

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Lab 2 Questions

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

Progesterone- maintains integrity of uterine lining. hCG (human chorionic gonadotrophin) - prevents degeneration of corpus luteum. HPL (human placental lactogen) - consists of 190 amino acids. It modifies metabolic state of mother during the pregnancy to facilitate energy supply to the fetus

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

Estrogen and progestogen, which are steroid hormones.

--Mark Woods 12:12, 11 August 2010 (UTC)

--z3254753 12:13, 11 August 2010 (UTC)

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Lab 3 Questions

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

Stages 7-9 during week 3 and stages 10-13 in week 4.

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

0.4mm to 3.5mm

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

At stage 11 (about 24 days) the cranial neuropore closes within a few hours. At stage 12 (about 26 days), the caudal neuroporecloses over a day.

--z3254753 08:22, 18 August 2010 (UTC)

Lab 4 Questions

1. Name the vessels that drain into the sinus venosus?

3 pairs of veinds drain into the sinus venosus, vitelline veins, umbilical veins, and cardinal veins (anterior, common and posterior).

2. What is the fate of the vitelline artery and vitelline vein?

Contribute to the liver of the human adult.

3. Name the 4 layers that constitute the placental barrier?

• Amnion • Chorionic plate • Intervillous place • Basal plate

4. What stem cells are found in abundance, and may be harvested from the placenta for therapeutic uses?

Amniotic stem cells.

--z3254753 08:06, 25 August 2010 (UTC)