Pregnancy

By Cheri Scheer

Objectives

Science 7-11-c Students will explain the structures of the human reproductivie system. Explaining the differences in trimesters.

Curriculum

PREGNANCY

PERIOD DURING WHICH THE BABY DEVELOPS IN THE UTERUS, NORMALLY 40 WEEKS

CONCEPTION

OCCURS AS A RESULT OF INTERCOURSE

BEGINNING OF PREGNANCY

FERTILIZATION

UNION OF A SPERM AND OVUM SEMEN IS DEPOSITED IN WOMAN’S VAGINA, SWIMS UP THROUGH THE CERVIX, THROUGH THE UTERUS, AND INTO THE FALLOPIAN TUBE

THIS SWIM TAKES SEVERAL HOURS

IF OVUM IS PRESENT, FERTILIZATION MAY OCCUR

SPERM AND OVUM HAVE UNITED

THE MEMBRANE ON THE OUTSIDE OF THE OVUM CHANGES AND DOESN’T LET OTHER SPERM ENTER

THE OVUM MOVES DOWN INTO THE UTERUS AND IMPLANTS INTO THE UTERUS LINING.

A. KNOWN AS EMBRYO FOR THREE MONTHS

B. KNOWN AS FETUS AFTER 3 MONTHS

FIRST TRIMESTER

4 WEEKSSHAPE OF HEAD DEVELOPS

BRAIN FORMS

FIRST HEARTBEATS

6 WEEKS - ABOUT 1 INCH LONG

EARS & EYES START TO FORM

ARMS & LEGS APPEAR

FIRST TRIMESTER8 WEEKS - 2 INCHES LONG

RECOGNIZABLE HUMAN

KIDNEYS WORKING

FINGER & TOES DEVELOP

PLACENTA & UMBILICAL CORD DEVELOP

12 WEEKSHEAD IS LARGE VS. BODY

SEX OF CHILD CAN BE DETERMINED

SECOND TRIMESTER16 WEEKS

HAIR,EYEBROWS & EYELASHES APPEAREYES SHUTSKIN COVERED IN FINE HAIR.

20 WEEKS - 8 INCHES LONG FINGERNAILSMOTHER FEELS MOVEMENTSUCKS THUMB

24 WEEKS - ABOUT 1.5 POUNDS CAN HEAR SOUNDSLOOKS LIKE A BABY

THIRD TRIMESTER28 WEEKS

EYELIDS OPENMOVES LIMBSSKIN COVERED IN YELLOW, WATER-RESISTANT SUBSTANCE

32 WEEKS- 5 POUNDSSKIN HEALTHY COLORLUNGS MATURINGLONG FINGERNAILS

36 WEEKS - 7 POUNDSTURNS HEAD DOWN TO ENGAGE FOR BIRTH

DELIVERY

CERVIX IS COMPLETLY DILATED AND BABY PASSES THROUGH THE BIRTH CANAL

TAKES 20 MINUTES TO TWO HOURS (PUSHING)

CHILDBIRTH

DELIVERY AND LABOR TAKES PLACE IN THREE STAGES

LABOR

WATER BREAKSWATER FROM SAC OF FLUIDS FETUS HAS BEEN IN FOR PROTECTION

CONTRACTIONS INVOLUNTARY MUSCLE MOVEMENT BY UTERUS

USUALLY ARE ABOUT 30 SECONDS LONG EVERY 10-15 MIN IN EARLY LABOR

BECOME STRONGER AND LAST 1 TO 2 MINUTES EVERY 2 MINUTES IN LATER LABOR

FORCES THE BABY’S HEAD AGAINST THE CERVIX CAUSING IT TO DILATE AND EFACE

CERVIX MUST DILATE TO 10 CM

DELIVERY OF AFTERBIRTH

PLACENTA, AMNIOTIC SAC, AND UMBILICAL CORD ARE EXPELLED FROM BODY

TAKES ABOUT 10-20 MINUTES