Reproductive Systems and Fertilization

Ms. LawHealth and Medical Sciences

Meiosis Review How sperm and

eggs are produced.

Male Reproductive System

Male Reproductive System

Function: To produce and deliver sperm to the female system

Testes: Make sperm and testosteroneInside

scrotum

To Regulate temperature.Why?

Not until puberty

Produces secondary sex characteristics-deeper voice, pubic hair, facial hair, body hair

Male sex hormone

Journey of the Sperm Inside testes are Semineferous Tubules

where sperm are produced through meiosis Mature sperm leave and are stored in the

Epididymous Sperm leave Epididymous they travel

through the Vas Deferens where fluid is added to them Sperm + Fluid=Semen

Vas Deferens is connected to the Urethra. During Ejaculation the sperm travel from the Vas Deferens to the Urethra then are ejaculated

Journey of the Sperm Testes in

ScrotumSemineferous Tubules (produce sperm)Epididymous (store sperm)Vas Deferens (fluids added)urethraSemen (sperm + fluids) ejaculated

Female Reproductive System

Female Reproductive System

Function: produce eggs, nuture fertilized eggs, give birth

Ovaries: Mature eggs and produce estrogen

Girls are born with all of their eggs, but do not start to mature until puberty

Produces secondary sex characteristics

Female Sex Hormone

Journey of the Egg Ovary releases an Egg into the Fallopian

Tube (Ovulation) Egg travels down the Fallopian Tube

towards the uterus If fertilized, egg will implant in wall of

uterus and begin to grow into a baby If NOT fertilized, egg will die and be

flushed away with menstruation (period).

Journey of the Egg OvaryFallopian Tube Uterus

(thickened with blood and tissue to prepare for fertilization)

Fertilized-egg will implant in wall of uterus and begin to grow into a baby

Unfertilized-egg will die and be flushed out with menstruation (period)

Fertilization Occurs in the fallopian tube Egg is released during ovulation Sperm is released into vagina by ejaculation

during sexual intercourse Sperm swim through uterus toward fallopian tubes Egg and sperm join nuclei during fertilization Egg (23 chromosomes)+ Sperm (23

chromosomes)= Zygote (46 chromosomes) Egg blocks more than one sperm from entering

Fertilization

Fertilization

Embryo Development After fertilization, zygote travels to uterus

where it implants-attaches to the wall Fertilized egg is dividing over and over Now called an embryo Placenta forms-provides the baby with

oxygen and nutrients from mom’s blood and removes waste

Embryo Development Embryo is surrounded by the

amnionfluid filled sac protects the baby Umbilical cord forms and attaches to

placenta-exchange of oxygen nutrients and wastes

Mom’s blood and baby’s blood never actually mix!

Embryo Development

Embryo Development

Embryo Development 1-2 months brain, spinal cord,

limb buds 3-6 months Movement,

fingernails, toenails, eyes, can hear sounds outside the womb

7-9 months lungs practice breathing, see light, sleeping patterns

9-10 months Birth