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1st sign of life
Protozoan completely self-sufficient in sea water world. Flagella on protozoan made moving possible -
Life was evolved from cells
Every living being made up of cells. Cells reproduce themselves by dividing into two similar cells. Cell's nucleus contains DNA -
Woman Reproduction
Ovary contains egg cells. Eggs contain 23 chromosomes. During ovulation, egg waits for sperm. Egg must join sperm within 24 hours to have conception. Hormones control women's entire reproduction cycle. -
Male Reproduction
Testicles produce million of sperm. Man must be cold to effectively produce sperm. Prostate gland secretes fluid. As sexual arousal is at it's peak, everything must function perfectly to perform ejaculation. Blood flow increases, rushes to penis, makes it erect. -
Conception and Growth of Human
Muscle contractions force out semen. As semen enters woman's body it slows down and becomes thicker. One quarter of sperm will die immediately due to acidity in vagina. After 20 minutes, surviving sperm will turn into fluid again. -
Sperm to Egg
Sperm are programmed to seek egg. After sperm reaches egg, sperm head breaks. DNA makes way out of sperm head. -
Cells
2 cells come together to form one new cell. After 24 hours, new cell divides. Within 10 days, blastcysts plants itself in uterus. -
More Conception
After 2 weeks, embryo is elongated. One-tenth of an inch long. Embryo is attached to placenta, this provides support. -
Embryo
Embryo has eyes -
Embryo
Embryo has arm shape, legs, and spine. -
Embryo
Fingers are well-defined. Toes are visible -
Embryo
Embryo is 2 and a half inches long. -
Embryo
3 inches long. Umbilical cord provides food supply -
Embryo
Can bring hands together and suck it's thumb -
Embryo
Sensory organs are formed -
Embryo
Fetus is actively turning inside mother -
Embryo
5 and a half inches long. Mouth, lips are formed. Eyes are closed but baby can see -
Embryo
All physiological systems have developed -
9 months later
BIRTH!!!!