Human Reproductive
System
Male Reproductive
System
Sperm Formation
•
•
•
•
•
MEIOSIS
Form in testes
Temperature important!
Scrotum
Leave testes via epididymus to
the vas deferens
Semen
• Fluids help to transport, feed,
and protect sperm
• Seminal vesicles
• Prostate gland
• Bulbourethral glands
Secondary Sexual
Characteristics - Male
• Produced by testosterone
– Deeper voice
– Axillary and pubic hair
– Chest and facial hair
– Lengthen bones
– Increased size of testes for
sperm production
Female Reproductive
System
Ovum Formation
• MEIOSIS
• Ova are formed before birth
• 1 ovum per month is matured and
released from ovaries
Secondary Sexual
Characteristics - Female
• Induced by increased LH, FSH,
estrogen, and progesterone
hormone levels
– Axillary and pubic hair
– Widen pelvis
– Enlarge mammary tissue
– Begin menstrual cycles
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
st
1
Trimester
• Heart develops first
• Neural tube develops
• All body systems appear by
Week 8 – Now a Fetus
nd
2
Trimester
• Mostly growth
• Looks more like a baby
• Some preemies survive at this
stage
rd
3
•
•
•
•
•
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?