OBJ: Given notes, activity sheet SWBAT describe the stages of human development from the zygote to adulthood with 70% accuracy.

BRING IN TEXTBOOKDN: HW check- Male/Female Reproductive System Booklet

ACT: Introduction to Human Life Cycle (notes)Text, read p. 232-240; Complete Human Life Cycle Booklet

HW: Complete Human Life Cycle Booklet; INERH Exam, March 23 (this Monday).

Human Life Cycle NotesFertilization: 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

Ovulation, Fertilization, Zygote

fertilized egg, life begins

uterus, womb

fallopian tube

Watch video

Cell Division

newborn baby

fetus

Zygote

Birth

9 months

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) enlargesDelivery: from uterus to outside worldAfterbirth: contractions push placenta and other membranes/fluid out through the vagina.

Amniotic Sac

Labor Delivery Afterbirth

Placenta

baby’s head with hair

I needmy coffeeNOW!!

Umbilical cord

Human Life Cycle NotesMultiple 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

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 12-14 yrs, ability to reproduce; produce baby

Young Adult: 20 to 50yrsSenior 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

Human Life Cycle Notes

Infancy Childhood Adolescence Young Adult Senior Adult

Human Life Cycle Notes