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

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?