28. Pregnancy and Human Development

Sperm capacitation and polyspermy

Fertilization

General Embryology - Detailed Animation On Fertilization

 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

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. 

Insights Into Male Fertility  Understanding Capacitation SD

Egg, Sperm, and Fertilization

Reproductive System - Sex & Fertilization

Learn the toughest concepts covered in Anatomy & Physiology 1&2 with step-by-step video tutorials and practice problems by world-class tutors



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1. Introduction to A&P

2. Chemistry

3. Cells

4. Tissues

5. Integumentary System

6. Bones + Skeletal Tissues

7. Skeletal System

8. Joints

9. Muscles and Muscle Tissue

10. Muscular System

11. Nervous Tissue

12. Central Nervous System

13. Peripheral Nervous System

14. Autonomic Nervous System

15. Special Senses

16. Endocrine System

17. Blood

18. Cardiovascular System: the Heart

19. Cardiovascular System: Blood Vessels

20. Lymphatic System

21. Immune System

22. Respiratory System

23. Digestive System

24. Nutrition, Metabolism, Energy Balance

25. Urinary System

26. Fluid and Electrolyte Balance, Acid Base Balance

27. Reproductive System

29. Heredity

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Labor initiation and stages

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Early Embryogenesis: Cleavage, Blastulation, Gastrulation, and Neurulation

Implantation

Placenta Formation and Functions

Extraembryonic Membranes

Gastrulation

Organogenesis and Roles of the Three Primary Germ Layers

Embryonic Development

Fetal circulation

Fetal period and fetal development

Fetal Development

Functional changes in maternal organs and systems during pregnancy

Maternal metabolism and posture during pregnancy

Effects of Pregnancy on the Mother

Preparation of breasts for lactation

Changes in the Mother and Newborn After Delivery

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