1. Explain how the ovum prevents polyspermy. 2. List and describe the initiation, progression and stages...

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Medical Sciences

1. Explain how the ovum prevents polyspermy.
2. List and describe the initiation, progression and stages oflabor.
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1 The ovum is be prevented by formation of fertilization membrane The egg membrane becomes thick during the cortical reaction due to cortical granule exocytosis This prevents the entry of sperm into the ovum 2 First stage of labor Thinning effacement and opening dilation of the cervix During the first stage of labor contractions help your cervix to thin and begin to open This is called effacement and dilation As your cervix dilates your health care provider will measure the opening in centimeters One centimeter is a little less than half an inch During this stage your cervix will widen to about 10 centimeters This first stage of labor usually lasts about 12 to 13 hours for a first baby and 7 to 8 hours for a second child The first stage of labor has three parts 1 Early labor Your cervix opens to 4 centimeters You will probably spend most of early labor at home Try to keep See Answer

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