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DAT ch 4
bio- embryology from coursesaver notes
| Question | Answer |
|---|---|
| Cleavage | results in progressively smaller cells (inc ratio of nuclear-to-cytoplasm & surface-to-volume ratio of each cell which improves gas exchange) |
| As cell division continues solid ball of cells called ____forms | morula |
| Blastulation | occurs when morula develops cavity called blastocoel |
| Blastula | becomes this by the 4th day - hollow sphere of cells |
| 6th day | blastocyst (AKA blastula) begins implantation into the uteral endometrium |
| little increase in size occurs during | gastrulation |
| Gastrulation | single cell layer of blastula transforms into three-layered gastrula |
| Ectoderm | Nervous system, integument (epidermis & hair / epithelium of nose, mouth, anal canal), lens of eye, retina, teeth, neural tube |
| Mesoderm | musculoskeletal, circulatory system, excretory system, gonads, connective tissue, portions of digestive & respiratory, notochord |
| Endoderm | epithelial lining of digestive & respiratory, parts of liver, pancreas, thyroid, and bladder lining |
| induction | process in an embryo in which one tissue causes another to differentiate |
| Eggs - Embryonic Membrane Chorion | (moist membrane =>** gas exchange) |
| Allantois | (sac-like involved in respiration and excretion/ blood vessels for transport) |
| Amnion | (amniotic fluid) - cushions and supports |
| chorionic gonadotropin hormone | secreted by the chorion (when it becomes part of the placenta) and helps maintain the Corpus Luteum (which secretes progesterone to maintain uterine lining) |
| Placental Internal Development | growing fetus receives oxygen directly from mother through specialized circulatory system (supplies O2 + nutrients / removes CO2 and wastes) |
| Placenta and umbilical cord | outgrowths of the four extra-embryonic membranes – amnion, chorion, allantois, yolk sac |
| Labor | cervix thins out and dilates, amniotic sac ruptures, rapid contractions followed by birth, then uterus expels umbilical cord and placenta |
Created by:
xeenie
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