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18 Cards in this Set
- Front
- Back
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Fertilization occurs in the oviduct.
____ latter the zygote begins cleavage. |
24 hours
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After ____ it implants in the endometrium.
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1 WK 5 more days
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It takes about ---- past fertilization for the blastocyst to form.
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1 week
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after fertilization the zygote that reaches the uterus as the embryo is a ball of cells.
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3- 4 days
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For the first ____ of development, the embryo obtains nutrients from the endometrium.
Then the placenta provides for the diffusion of material between maternal and embryonic circulations. |
2-4 weeks
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Heart is beating
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wk 4
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all of the major structures of the adult are present in rudimentary form
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wk 8
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The rapidity of development makes this a time when the embryo is especially sensitive to environmental insult. (Trimester)
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1st
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Maternal changes during first trimester
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Maternal changes during the first trimester.
1The embryo secretes human chorionic gonadotropin (HCG). 2Maintains the corpus luteum and thus maintains the endometrium. 3High levels of progesterone cause. -Increased mucus in the cervix. -Growth of the maternal part of the placenta. -Enlargement of the uterus. -Cessation of ovarian and menstrual cycling. -Rapid enlargement of breasts. |
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Fetus grows rapidly and is very active.
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2nd trimester
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Placenta secretes progesterone, which maintains the pregnancy.
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2nd trimester
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Corpus luteum deteriorates
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2nd trimester
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Hormonal levels stabilize as HCG declines.
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2nd trimester
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Fetus grows rapidly.
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3rd trimester
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Terminates with parturition (birth).
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3rd trimester
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Maternal abdominal organs become compressed and displaced
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3rd trimester
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Fetal activity may decrease as the fetus fills the space available to it.
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3rd trimester
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Pregnancy takes
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266 days
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