Human Reproductive System Male Reproductive System Sperm Formation
- Slides: 13
Human Reproductive System
Male Reproductive System
Sperm Formation • MEIOSIS forms sperm in gametes • Sperm forms in testes • Scrotum kept cooler than the rest of the body • Semen is sperm plus protecting fluid (seminal fluid) • Semen leaves testes through the vas deferens (sperm ducts) to the urethra before it exits.
Secondary Sexual Characteristics - Male • Produced by testosterone – Deeper voice – Chest and facial hair – Lengthen bones – Increased size of testes for sperm production
Female Reproductive System
Ovum Formation • MEIOSIS forms the eggs (ova) • Eggs are formed prior to birth • 1 egg per month matures and is released from the ovaries • Eggs travel through the fallopian tube where they may become fertilized
Secondary Sexual Characteristics - Female • Induced by increased LH, FSH, estrogen, and progesterone hormone levels – Pubic hair – Widening of the pelvis – Enlargement of mammary tissue (breasts) – Begin menstrual cycles
Fertilization • • Occurs in upper 1/3 of Fallopian tube Only 1 sperm can fertilize an egg Fertilized egg = zygote An average woman is pregnant (gestational period) for 9 months or approximately 40 weeks. Babies can survive if they are born earlier, but they may have complications due to being premature.
Implantation • Fertilized eggs are implanted into thick walls of uterus • Chorion membranes dig into uterus to form placenta • Zygote grows into an embryo • Embryo gets air and nutrients through the umbilical cord • Once pregnant, progesterone levels stay high in mom, often causing nausea
1 st Trimester = 1 st 12 weeks • Heart develops first • Neural tube develops • All body systems present by Week 8 – Now a Fetus
2 nd Trimester = up to 24 weeks • Mostly growth is occuring • Looks more like a baby • Some preemies can survive at this stage
3 rd Trimester = Up to 40 weeks • • • Growth continues Kicking, rolling, stretching Eyes open – Week 32 Lungs mature Rotates to head-down position, unless baby is breech
Birth • Labor – Uterine contractions begin – Cervix dilates to 10 cm • Birth – Uterine contractions push baby through vaginal canal – Placenta delivered after baby (after birth) – Cesarean Section (c-section) is a surgical procedure that cuts through the uterus to deliver the baby if it cannot be born vaginally
Where sperm is stored
Pathway of semen
Killer whale eating sea lion
From where sperm is produced
Which human organ system produces sperm or egg cells? *
Function of the vagina
Male reproductive system and its function
Drawing of the male and female reproductive system
Exercise 42 anatomy of the reproductive system
Lutalphase
Copyright
Female and male reproductive system
Male reproductive organ
Reproductive physiology
