lifecycle/pregnancy. the beginning of the life cycle
TRANSCRIPT
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Lifecycle/Pregnancy
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The Beginning of the Life Cycle
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Conception: An egg travels through the fallopian tube after ovulation; if a sperm makes its way from the vagina through the uterus to the egg within 72 hours, conception is likely to occur.
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If sperm penetrates the
egg and conception occurs. It is
called a zygote until it reaches the uterus in 3-
4 days.
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Upon implantation, complex connections between the mother and embryo develop to form the placenta
The embryo may float freely in the uterus for about 48 hours before implanting.
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What is the placenta?
• Answer: a thick, blood rich tissue that lines the walls of the uterus during pregnancy and nourishes the embryo
• The umbilical cord connects to the embryo and the placenta
• The umbilical cord is a ropelike structure that connects the embryo to the mother’s placenta = BABY’S LIFELINE
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The Umbilical Cord
• Answer: materials diffuse from one blood supply to the other through the umbilical cord.
• Nutrients and oxygen pass from the mother’s blood to the embryo and wastes from the embryo diffuse into the mother’s blood.
• Eventually, they are excreted.
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Leaving the Womb
• A female goes through three stages of labor to deliver a baby. Labor can last for a few hours to several days.
• Stage 1: Dilation• Stage 2: Passage through birth
canal• Stage 3: Afterbirth
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Stage 1: Dilation
• Contractions of the uterus cause the cervix to dilate.
• Why can the uterus contract?• Contractions will break the amniotic
sac, the sac that surrounds the body.
• Only 25% of women experience their water breaking
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Stage 2: Passage through Birth Canal
• Only when the cervix is fully dilated (10 cm), the baby passes through the birth canal (vagina) and emerges from the mother’s body.
• Right after birth, the baby takes its first breath and cries to clear the lungs of amniotic fluid.
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Stage 3: Afterbirth
• The placenta is still attached to the baby by the umbilical cord. Contractions continue until the placenta also called afterbirth, is pushed from the mother’s body.
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Prenatal Care• Regular Doc’s Appointments: once a month
until full term (37 weeks) last month of pregnancy (once a week)
• Ultrasound (20 weeks) • Determine sex, check for any abnormalities
thus far• Diet: Numerous restrictions regarding food, drink
and activity• Avoid: caffeine, alcohol, excessive weight
gain, sushi, lunchmeat, raw meat, tobacco products, etc.