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15 Cards in this Set
- Front
- Back
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WHAT IS the time period for prenatal development + postnatal development
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prenatal development is 38 weeks + the postnatal development is from birth to death
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why is capacitation necessary for fertilization
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the acrosomal enzymes break down the corona radiata + zona pellucida to create an opening for the sperm
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where does fertilization usually takes place and on what day of the menstrual cycle is it likely to occurs
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fertilization take place in the uterine tube on the 14th day of the menstrual cycle
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what is the name of the single cell that is the result of fertilization? how many chromosomes does it delivery
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zygote. 46 chromosomes
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how long does the preembryonic period last, and what developmental events occurs during this time
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the preembryonic period last 2 weeks. Cleavage, implantation and the formation of the primary germ layers occurs during this time
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what are the 3 parts of a blastocyst?
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blastocele (cavity), trophoblast (cells around trhe periphery) and inner cell mass (cluster of cells along one side).
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what hormone is secreted by the trophoblast cells and what is its function?
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the trophoblast secretes human gonadotropin. It has a similar action to LH because it causes the corpus luteum to remain functional + secrete progesterone to maintain the endometrium
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name the primary germ layers and list 5 derivatives from each one
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primary germ layers:ECTODERM(derivatives: epidermis of skin,hair, nails, skin glands, lensy of eye, enamel of teeth,all nervous tissues. MESODERM(derivatives:dermis of skin, skeletal smooth, cardiac muscle, ephitelium of serous membrane, epithelium of joint cavities,epithelium of blood vessels. ENDODERM: (derivatives: EPITHELIUM OF: LIVER + PANCREAS, RESPIRATORY tract, epithelial lining of digestiv tract,tyroid,parathiroid and thymus gland
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how long does the period of embryonic development last, and what takes place during this time?
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the period of embryonic development last for 6 weeks. Significant developments include the formation of extraembryonic membranes, formation of the placenta, formation of all organ systems in the body
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what is the function of: amnion
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a)amnion: is a fluid-filled sac that surrounds the developing embryo. fluid cushions + protects the embryo, maitains the temperature + pressure around it, allow freedom of movements
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what is the function of: chorion
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chorion constribute to the fomration of placenta
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what is the function of: yolk sac
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yolk sac produces the primordial germ cells which migrate to the developing gonads + produce blood until liver is sufficiently developed.
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what is the function of: allantosis
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allantosis contributes to the development of the urinary bladder + the umbilical vessels
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what is the function of: placenta
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placenta is the site of gaseous exchange between the fetal blood + maternal blood
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how long does the fetal period development last, and what two fundamental processes take place during this period?
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fetal period development last 30 weeks. from week 9th until parturition.it is the period of grow + maturation of organ systems.
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