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Attendance

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This is an internal link: Cell Division Lecture

This is an external link: SMH

Sperm meets egg

New sub heading

Now I can edit a subheading section

Picture

Early zygote.jpg

Lab Questions

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

They secrete hCG (human chorionic gonadotropin) to prevent the disintegration of the corpus luteum to support the ongoing pregnancy.


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

It secretes progestogen to maintain the endometrium of the uterus thus preventing the continuation of the mestrual cycle.

Lab 3 Questions

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

Stages 7-13

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

wk3:0.7mm diameter wk4: 3-5mm length

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

Cranial neuropore closes at about 24 days and caudal neuropore closes at about 26 days

Lab 4 Questions

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

Vitelline, placental vessels and common cardinal vein

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

Vitelline artery will contribute to adult GIT arteries and vitelline vein would contribute to the adult portal system

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

syncitiotrophoblast, cytotrophoblast, villi connective tissue and fetal capillary endothelium.

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

hematopoietic stem cells

Lab 5 Questions

1) What is the origin of the gastrointestinal tract smooth muscle?

Splanchnic mesoderm

2) At what Carnegie stage does the buccopharyngeal membrane begin to break down?

Carnegie stage 11

3) Identify the lung developmental stage in late embryonic to early fetal period.

Embryonic development of the lungs begins in stage 14 (branching of bronchial tree). The development of the functional alveoli begins from stage 22 until late fetal.

4) In premature infant birth, which respiratory cell type may not have fully developed?

The type 2 alveolar cells which are responsible for surfactant secretion maybe not be fully developed by premature infant birth.