Top Posters
Since Sunday
g
2
1
1
Home Gallery General Biology
Explore Categories
  
SlideshowReport

Embryonic Period
Download Without Watermark With Free Membership
Description
The embryonic period extends from fertilization through the eighth week of development.
Fertilization—merging of genetic information from sperm and secondary oocyte.
Sperm swim from the vagina to the cervix using their tails.
Sperm pass through the uterus and uterine tubes mainly due to contraction of the walls of these structures.

To fertilize an egg, sperm must penetrate the corona radiata (granulosa cells) and the zona pellucida (glycoprotein layer outside of the oocyte’s plasma membrane).

The enzymes of the sperm’s acrosome, along with tail movement, allow the sperm to penetrate the corona radiata.
Glycoprotein ZP3 in the zona pellucida is a receptor for the sperm.
Membrane proteins in the sperm head bind to ZP3 and acrosomal enzymes are released to digest a path in the zona pellucida.
Related Images
 257
 255
 250
 233
 231
 220
 210
 217
 245
 228
Add Comment
Explore
Post your homework questions and get free online help from our incredible volunteers
  634 People Browsing
 102 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Show Emoticons
:):(;):P:D:|:O:?:nerd:8o:glasses::-):-(:-*O:-D>:-D:o):idea::important::help::error::warning::favorite:
Your Opinion
Where do you get your textbooks?
Votes: 733
Previous poll results: Do you believe in global warming?