pregnancy and development
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what is the structure surrounding an egg | corona radiata
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| how sperm fertilize an egg | 1
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| what much the sperm breakthrough to get to the egg | corona radiata layer
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| when a sperm reach an egg, enzymes are released from ..... at the sperm head | acrosome
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| where does fertilization actually take place | fallopian tubes
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| how often does a fertilized egg divide | once a day for the first 5 days
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| what is the ball of cells called after the first 5 days | morula
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| what happens to the morula after 5 days | cells become hollow with stem cells inside that develop into a fetus
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| when the ball of stem cells deposit in the uterine wall it is now called a | blastocyst
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| name the outer cells of the blastocysts | trophoblast
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| what does trophoblast do | invade the endometrium wall
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| why doe the trophoblast invade the endometrium wall | to start forming the placenta and umbilical cord for baby to recieve nutrients from the mother
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| what prevents the egg shell within the ovary from degenerating | hCH Human Chorionic Gnadotropin
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| the site of gas exchange within a fetus | chorionic villi
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| how is oxygen provided and waste removed from a fetus | through the chorionic villi and unbilical cord
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| at 2 weeks the trophoblast had developed into | yolk sac and amnion
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| the yolk sac structure will become the... of the baby | digestive tract
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| the amnion will become the... during the pregnancy | amniotic sac
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| between the yolk sac and the amnion are 3 layers called | germ layers
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| what are the 3 germ layers | endoderm (yolk side)
mesoderm (middle side)
ectoderm (amnion side)
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| the ectoderm will develop into | nervous system, skin, nails, eyes
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| the mesoderm will develop into | muscular system, skeletal system, reproductive system, urinary system and cardiovascular system
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| the ectoderm will develop into | lungs, digestive system and liver
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| the nervous system starts as a sheet of cells and folds over to form | neural tube
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| if the neural tube doesn't fully complete and close off what happens | baby born with spina bifida
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