Development of fetal circulation

Development of fetal circulation - through the mothers...

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Development of fetal circulation: o ductus venosus : liver bypass foramen ovale : pulmonary circuit bypass from right atrium to left atrium ductus arteriosus : pulmonary circuit bypass from pulmonary trunk to aorta Events of Fetal Development: see chart page 1080-1081 (no questions on exam) Prenatal Diagnostic Tests: - Fetal Ultrasonography reflected by the fetus are converted to an on-screen sonogram image o used to confirm pregnancy, determine accurate fetal age, evaluate fetal viability, abnormalities Kevin Kelleher, MTC Biology 211 Study Notes Exam 4 17 - Amniocentesis : amniotic fluid is withdrawn with a hypodermic needle inserted
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Unformatted text preview: through the mothers abdominal wall & into the amniotic cavity within the uterus o Fluid is then used to test for abnormal protein levels (AFP) or as a source of cells for testing DNA for chromosomal damage or genetic disorders- Chorionic Villi Sampling : a catheter is guided through the vagina & uterine cervix to chorionic villi (using ultrasound as a guide), & tissue (~ 30 mg) is suctioned out for chromosomal analysis- Noninvasive Prenatal Tests : tests under development that do not entail penetration of embryonic structures o maternal alpha-fetoprotein (AFP) test: abnormal (high) levels of AFP in maternal circulation after week 15 may indicate nervous system defects (spina bifida, anencephaly) page4...
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