Presentation on theme: "Prenatal Development October 7, 2011. Good Morning! 3/6/14 Today’s Agenda: Turn in Portfolio Entry #2 Finish Prenatal Development Video Start."— Presentation transcript:
Prenatal Development October 7, 2011
Good Morning! 3/6/14 Today’s Agenda: Turn in Portfolio Entry #2 Finish Prenatal Development Video Start Prenatal development notes Interims – Clarity issue Next week: Prenatal development
Vocabulary Amniotic Fluid – protects the developing baby, cushions against bumps or falls Conception – when the ovum and a sperm unite Embryo – 2 nd stage of pregnancy: 3 rd -8 th week. Rapid growth. Fetus – 3 rd stage: 9 th week to birth
Vocabulary Ovum – a female cell or egg Placenta – Tissue rich in blood vessels. Provides path to nutrition. Umbilical cord – brings nourishment to the baby and takes waste away. Stiff and firm like a garden hose, filled with water. Uterus – organ in a woman’s body where the baby develops.
Conception Woman’s body releases an ovum that travels through the fallopian tubes to the uterus. Meets up with a sperm and is fertilized. Pregnancy begins!
3 Stages of Pregnancy Period of the Zygote – Lasts for 2 weeks Period of the Embryo – 3 rd -8 th week Period of the Fetus – 9 th week to Birth
Period of the Zygote The zygote (fertilized egg) travels down fallopian tubes and attaches to uterus Uterus provides soft, warm bed and a source of nourishment Zygote grows by cell division – from 1 to a mass of cells At end of this period, zygote is the size of a pinhead
Period of the Embryo 2 nd Stage of pregnancy – 3 rd -8 th week Embryo grows rapidly and goes through lots of important changes Mass of cells develop into major systems – heart, lungs, bones and muscle A sac filled with fluid forms around the embryo for protection
Period of the Embryo Sac is filled with amniotic fluid – cushions baby against bumps and falls The Placenta develops – blood vessels carry food and oxygen to the placenta Umbilical cord brings food and oxygen to baby and takes waste away What would happen if the cord were pinched?
Period of the Fetus 3 rd stage – 9 th week until birth As the baby grows, the fluid around baby and the uterus expand also Body is developing so it can live independent of the mother Fetus gains weight rapidly – from thin and wrinkly to smooth and rounder
Fetus Can do many things before birth – suck its thumb, cough, sneeze, yawn, kick, hiccup and cry. Can live outside of the uterus by the 7 th month, but only with lots of medical help Premature baby – delayed development
Group Activity Write the following titles on each piece of paper: Period of the Zygote Period of the Embryo Period of the Fetus Each person writes one fact until each has written on each paper and you have run out of facts
Preparing for birth During the 9 th month, baby shifts downward – dropped into the birth canal This shift is called “lightening” – could take place several days or weeks before labor begins Fetus is typically upside down at this point – easiest and safest position for birth Fetus is less active – less room to move
Preparation Mothers skin and muscles are stretched Uterus and abdomen can be stretched up to 60 times their original size Return to close to normal size within 6 weeks or so after birth After 37-42 weeks, the baby is ready to be born