User:Z3330795

Lab Attendance Lab 1

--Z3330795 11:49, 25 July 2012 (EST)

Fertilization

The process in Simple Steps:

Step 1 - Many sperm travel from the Male testes to the Female Egg located in the Fallopian tube.

Step 2 - Once the sperm reach the egg, many try and "enter" by releasing enzymes breaking down the outer layer of the egg.

Step 3 - Only one sperm can penetrate and once this happens, a chemical reaction occurs "pushing" away any other sperm attempting to penetrate.

This now fertilized egg is referred to as a zygote

Step 4 - pronuclei of the egg merges with the pronuclei of the sperm resulting in cell division.

Step 5 - days later this zygote is moved along the fallopian tube and is now called a blastocyst.

Step 6 - the blastocyst is embedded in the uterine wall activating the start of pregnancy.

References: http://science.howstuffworks.com/ http://blogs.discovermagazine.com/discoblog/files/2009/07/spermweb.jpg http://www.letstalkaboutit.org.uk/images/pejuweb7.jpg?886 http://embryology.med.unsw.edu.au/embryology/index.php?title=Zygote http://sims.ie/_fileupload/Image/blastoimage.gif http://medicalimages.allrefer.com/large/early-pregnancy.jpg