28. Pregnancy and Human Development

Sperm capacitation and polyspermy

Fertilization

Insights Into Male Fertility  Understanding Capacitation SD

 24 hours before ovulation; two days after 

 The oocyte is viable for 12 to 24 hours after it is cast out of the ovary. The chance of pregnancy drops to almost zero the next day. Most sperm retain their fertilizing power for 24 to 48 hours after ejaculation. Consequently, for successful fertilization to occur, coitus must occur no more than two days before ovulation and no later than 24 hours after. 

 three days before ovulation; two days after 

 two days before ovulation; 24 hours after 

 two days before ovulation; two days after 

 For successful fertilization to occur, coitus must occur NO more than __________ and NO later than __________. 

Fertilization: Capacitation, Acrosomal Reaction, and Polyspermy Block

General Embryology - Detailed Animation On Fertilization

Reproductive System - Fertilization

 the release of Ca<sup>2+</sup> after the sperm has entered the ovum 

 a decrease in zonal inhibiting proteins 

 the release of enzymes into the extracellular space beneath the zona pellucida 

 Which of the following does NOT prevent polyspermy? 

 The sperm has a tail that allows it to be motile, but it does not play a role in helping it locate the oocyte. 

 Acrosomes contain hydrolytic enzymes that help the sperm penetrate the membrane around the secondary oocyte, but they do not play a role in locating the oocyte. 

 The hydrolytic enzymes help the sperm penetrate the layers around the oocyte during fertilization, but they do not play a role in locating the oocyte. 

 Sperm are known to bear __________ that respond to chemical stimuli that help them locate the oocyte. 

Egg, Sperm, and Fertilization

Reproductive System - Sex & Fertilization

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