Z3218792

Lab 1 Questions:

Q1. What is the protein that sperm binds to on the surface of the ova?

ZP3, a protein from the zona pellucida

Q2. Name the 3 stages of follicular development in the ovary:

primordial, preantral and antral

present--Gabriela Pinget 13:14, 6 August 2009 (EST)

Lab 2 Questions

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

The Human Chorionic Gonadotropin (hCG) hormone and the proteolytic enzymes- they degrade the extracellular matrix around cells

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

progesterone as signaled by the hCG hormone produced by the trophoblast cells of the blastocyst

3. What are the 2 main tissues to be derived from the germ cell layer continuous with the lining of the amniotic sac?

ectoderm and endoderm

--Gabriela Pinget 13:55, 13 August 2009 (EST)

Week 3 Lab Questions:

What period of human development (in weeks) do the 23 Carnegie stages cover?

Carnegie Stage 23 is equivalent to week 8. Hence this covers week 0 to week 8 in the stages of development.

What part of the somite will contribute to the vertebral column?

The medially differentiated cells in the somite form the sclerotome which forms the vertebral column.

At what Carnegie stage does the human neural tube normally completely close?

By Carnegie stage 13, the neural tube is normaly completelly closed

--Gabriela Pinget 13:51, 20 August 2009 (EST)