Z3252231

1- What is the protein that the sperm binds to on the surface? zona pellucida lipoprotein ZP3 2-Name the three stages of follicle development? primordal follicle, pre-antral follicle and antral follicle(Graffian follicle is the mature follicle). --Angama Yaquobi 13:13, 6 August 2009 (EST)

Lab 2-

What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy? -Human Chorionic Gonadotrophin

What does the corpus luteum secrete to prevent continuation of the menstrual cycle? -estrogen and progesterone

What are the 2 main tissues to be derived from the germ cell layer continuous with the lining of the amniotic sac? - nervous system from the neural tube and neural crest -epithelial layer of the skin covering the embryo.

--Angama Yaquobi 13:06, 13 August 2009 (EST)

ASSESSMENT LAB 3 1. What period of human development (in weeks) do the 23 Carnegie stages cover? Weeks 8-9. 2. What part of the somite will contribute to the vertebral column? Sclerotome

--Angama Yaquobi 13:11, 20 August 2009 (EST)

3. At what Carnegie stage does the human neural tube normally completely close? Stage 13 --Angama Yaquobi 13:11, 20 August 2009 (EST)