Human_Sexuality_Chaper_7[1]

Human_Sexuality_Chaper_7[1] - HumanSexuality:Chapter7...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
11/09/11 1 Human Sexuality:  Chapter 7 Pregnancy and Childbirth Dr. Katherine Helm
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
11/09/11 2 Ovum moves through FT to uterus, taking 3 to 7 days Can only be fertilized during 1sst 24 hrs. after leaving  the ovary 200 – 300 mill sperm are ejaculated into vagina; try to  Intercourse can result in conception only 6 days out  of every 28-day cycle Sperm undergo  capacitation  to soften egg’s outer  layers If 1 sperm penetrates egg = a simultaneous chemical  reaction to prevent other sperm from doing so W/in 24 to 30 hrs., 1-cell organism called zygote is  formed (morula blastocyst, etc.  Cells dividing)
Background image of page 2
11/09/11 3 Implantation Endometrium receptive to implantation for 4-5 days Trophoblast forms 4 protective layers:  1 layer  produces blood cells for embryo until it can do so  on its own; 2 nd  layer = umbilical cord; 3 rd  = amnion;  4 th  placenta 3/4 th  of conceptions fail or spontaneously abort w/in  1 st  6 wks. Ectopic preg – usu. in FTs; can break FTs Can be caused by PID; previous EPs; smoking,  douching, increased age of mom Pregnancy lasts 260-270 days Divided into 3-mon. periods = trimesters 
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
11/09/11 4 1 st  Trimester Morning sickness – not just in a.m.; nausea;  dizziness; tiredness – usu. b/g 4-6 wks. into  pregnancy reaches peak by 12 wks.; no known  tx. Men = Couvade Syndrome (sympathy pains) Embryo rapidly develops:  ectoderm forms  N.S., skin & teeth; mesoderm forms muscles,  skeleton & blood vessels; Endoderm forms  internal organs 3 rd -6 wks = CNS dev., heart, genitals, internal  organs 8 wks. = called a fetus
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/08/2011 for the course PSYCH 262411 taught by Professor Katherinehelm during the Fall '11 term at Lewis University .

Page1 / 16

Human_Sexuality_Chaper_7[1] - HumanSexuality:Chapter7...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online