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)

  1.  Into what structure do most blood vessels empty before they enter the embryonic heart? 
SINUS VENOSUS

  2. What do the dorsal aortas become in the adult? 

THE DESCENDING AORTA

  3. What are the layers of cells found in a tertiary villi? 

TROPHOBLAST,MESODERM AND BLOOD VESSELS.