Chapter 17 Reproduction in Humans Lesson 3 - sexual intercourse fertilization_pregnancy

Sexual Intercourse & Fertilization

Sex ,[object Object],http:// www.avert.org/cpills.htm

What causes pregnancy? ,[object Object],[object Object],[object Object],Why?

Fertilisation Sperm trying to penetrate egg Fusion of 2 haploid gametes

Human Fertilization ,[object Object],[object Object],[object Object],[object Object]

The process of fertilisation…

Development of the Embryo ,[object Object],[object Object],[object Object],[object Object]

Fertilization and Implantaton Implantation of blastocyst Day 7 Fertilization Day 4 Day 3 Day 2 Day 1 Day 0 Egg released by ovary (DAY 0) Blastocyst Morula 4 cells 2 cells Zygote *Days are not indicative of menstral cycle days. Uterine wall Ovary Fallopian tube 1. 2. 3.

Identifying the structures of the fetus in the uterus (worksheet)

Development of the Embryo ,[object Object],[object Object]

Function of amniotic fluid ,[object Object],[object Object],[object Object],[object Object],[object Object]

Development of the Embryo ,[object Object],[object Object],[object Object]

Placenta ,[object Object],[object Object],[object Object]

Functions of the placenta ,[object Object],[object Object],[object Object],[object Object]

Facts to note: ,[object Object],[object Object],[object Object]

Development of the Human Fetus 8 th week of pregnancy foetus at week 20 sucking thumb

TWINS!!! ,[object Object],[object Object],[object Object],http://www.pregnancycheck.com/pictures-of-pregnancy-stages.html

How twin pregnancies happen ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why Sex? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why not sex? ,[object Object],[object Object],[object Object],[object Object],[object Object]

BE WARNED!!! But It Wasn't Really Sex, Was It?

Common Misconception ,[object Object],[object Object],[object Object],[object Object]

“ Not-Really-Sex" Sexual Behavior ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Abstinence – the best form of defence ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chapter 17 Reproduction in Humans Lesson 3 - sexual intercourse fertilization_pregnancy

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