1. OBJ: Given notes, activity sheet SWBAT describe the stages of human development from the zygote to adulthood with 70% accuracy BRING IN TEXTBOOK DN: HW check- Male/Female Reproductive System Booklet ACT: Introduction to Human Life Cycle (notes) Text, read p ; Complete Human Life Cycle Booklet HW: Complete Human Life Cycle Booklet; INERH Exam, March 23 (this Monday).

2. Human Life Cycle Notes
Fertilization: joining of sperm and egg forming zygote.
Zygote (one-cell stage): fertilized egg
Pre-birth Development:
Zygote → Embryo → Fetus → (birth) → newborn baby
Embryo: from “two cell stage” to 8 weeks;
cell division occurs.
Fetus: 9 weeks to birth ~ 9 month

3. Ovulation, Fertilization, Zygote
Cell Division
Watch video
fertilized egg, life begins
fallopian tube
uterus, womb

4. Zygote
fetus
newborn baby
9 months
Birth

5. Amniotic Sac: fluid filled sac that cushions/protects embryo/fetus
Placenta: regulating organ between baby & mother; nutrients/oxygen in & waste out
Umbilical cord: connects embryo to placenta
(belly button)
(see transparancy)
Birth: ~ 9 month in humans; three stages:
labor, delivery, afterbirth
Labor: strong muscular contractions of uterus, cervix (opening) enlarges
Delivery: from uterus to outside world
Afterbirth: contractions push placenta and other membranes/fluid out through the vagina.

7. Amniotic Sac

8. Labor Delivery Afterbirth
I need
my coffee
NOW!!
baby’s head with hair
Placenta
Umbilical cord

9. Human Life Cycle Notes Multiple Birth: see transparancy
Identical twins: from a single fertilized egg that splits results in two genetically identical individuals (copies; natural clone).
Fraternal twins: two different eggs released & fertilized by two different sperm; two different individuals sharing the same womb

10. Adolescence (13-19): gradual change from child to adult
Infancy (1-2 yrs): dramatic change in shape & size; nervous / muscular system development; learning new physical skills.
Childhood (2-12 yrs): more active, independent, further physical & mental changes
Adolescence (13-19): gradual change from child to adult
Puberty (9-15yrs): At yrs, ability to reproduce;
produce baby
Young Adult: 20 to 50yrs
Senior Adult: 60+ yrs; wisdom, knowledge about life
Aging: (30+ yrs) skin begins to wrinkle, decrease muscle strength, changing hair color, eye problems (40-65 yrs) menopause (ovulation, menstruation stops), decrease sperm
Slow Aging: diet, exercise

11. Human Life Cycle Notes
Infancy Childhood Adolescence Young Adult Senior Adult

12. Human Life Cycle Notes