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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.
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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 – 2nd stage of pregnancy: 3rd-8th week. Rapid growth. • Fetus – 3rd stage: 9th 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 – 3rd-8th week • Period of the Fetus – 9th 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 • 2nd Stage of pregnancy – 3rd-8th 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 • 3rd stage – 9th 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 7th 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 9th 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
