1. Sperm Production - Recap
starts at puberty
made in the seminiferous tubules
about 74 days from start to maturity
24/7 production from puberty to death
About 50% - 70% viable

2. Steps in Pregnancy Ovulation Egg is released from the ovary
Egg remains viable for hours
Sometimes ovulation happens first.

3. Steps in Pregnancy Ejaculation
million sperm (in semen) ejaculated into the vagina and
Sperm are not Capable of fertilizing an egg until 4-6 hours after ejaculation
Sometimes ejaculation happens first.

4. Pregnancy (cont) about 1000 sperm make it to the egg
Sperm can remain viable for up to 7 days (3-5 average)

5. Fertilization One sperm gets into the egg In the fallopian tubes
results in a zygote

6. Pregnancy (cont)
The cells in the zygote begin to multiply

7. Pregnancy (cont) Pregnancy begins after implantation
6-10 days later the zygote implants
Pregnancy begins after implantation
fertilization + implantation = conception

8. Implantation fertilized egg attaches to the endometrium in the…
Endometrium provides nutrients during early pregnancy
Placenta takes over around 7 weeks

9. Pregnancy (cont) Pregnancy is about 40 weeks long
Divided into trimesters, each about 13 weeks
Embryo – from 2 weeks to 8 weeks
Fetus – From 8 weeks to birth