Post on 02-Jul-2015
Human Reproductive System
Part JobTestis Produces sperm cellsScrotum Sac that holds the testisPenis Penis Places sperms into
the vagina during mating
Vas deferens Carries sperm from testes to urethra
Urethra Carries sperm out of the body
Glands
a. seminal vesicle
b. prostate gland
c. Bulbourethral gland
Provide liquid in which sperm can swimSecretes one of the components of the semenSecretes a milky fluid that is discharged into theurethra as part of the semenMucous secreting glands located at the base of thepenis
Male Reproductive System
The female reproductive system has the following
functions:
• 1. Production of female sex cells• 2. Reception of sperm cells from
the male• 3. Nurturing the development of
and providing nourishment for, the new individual
Part Job
Ovary Produces egg cells
Oviduct Oviduct Passageway of eggs from the ovary to the uterus(also the same place where the egg is fertilized.
Uterus Place where fertilized egg develops
Vagina Receives penis of male during mating
Female Reproductive System
The Menstrual Cycle
Fertilization
• Occurs in upper 1/3 of Fallopian tube
• Once one sperm enters, egg membrane changes
• Fertilized egg = zygote
Implantation
• Implanted into thick walls of uterus
• Chorion membranes dig into uterus to form placenta
• Embryo supported via umbilical cord
• Once pregnant, progesterone levels stay high in mom
1st Trimester
• Heart develops first• Neural tube develops• All body systems appear by
Week 8 – Now a Fetus
2nd Trimester
• Mostly growth• Looks more like a baby• Some preemies survive at this
stage
3rd Trimester
• More growth• Kicking, rolling, stretching• Eyes open – Week 32• Lungs mature• Rotates to head-down position
Birth
• Labor– Uterine contractions begin– Cervix dilates to 10 cm.
• Birth– Uterus pushes baby through
vaginal canal• Placenta delivered after
Most of this not fun?