1) " Fetal" -- As it applies to Fetal Ultrasound Fetus at eight weeks A fetus (alternatively foetus or fœtus) is an embryo inlater stages of development, from the third month of pregnancy until birth in humans. Fetus literally means 'youngone'. Contents 1 Fegal growth 2 Circulatory system 2.1 Postnatal development 2.2 Developmental problems 2.3 Differences to the adult circulatory system 3 Legal 4 Etymology and spelling variations 5 See also Fetal growth There is much natural variation in the growth of the fetus. Approximately 40% of the variation in birth weight can be accounted for by genetic factors, whereas 60% can beaccounted for by environmental factors. Ultimately, the baby should beable to live up to its term growth potential. Factors affecting Feral growth can be maternal, placental, or Feta . Maternal factors include maternal size, weight, weight for height, nutritional state, anemia, cigarette smoking, substance abuse, or uterine blood flow. Placental factors include size, microstructure (densities and architecture), umbilical blood flow,transporters and binding proteins, nutrient utilization and nutrient production. Fetal factors include the fetus genome, nutrient production, and hormone output. Inappropriate growth can result in low birth weight. If the newborn is small for gestational age, he or she will have an increased risk forperinatal mortality ( death shortly after birth), asphyxia, hypothermia, polycythemia, hypocalcemia, immune dysfunction, neurologic abnormalities, and other long-term health problems. This can be the resultof Fstal growth restriction. Circulatory system The circulatory system of a human fetus works differentlyfrom that of born humans, mainly because the lungs are not in use: the fetus obtains oxygen and nutrients from the mother through the placenta and th...
2) " Ultrasound" -- As it applies to Fetal Ultrasound Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz. Some animals, such as dogs, dolphins, and bats, have an upper limit that is greater than that of the human ear and thus can hear Ultresound . Ultrasound has industrial and medicalapplications. Medical ultrasonography can visualisemuscle and soft tissue, making them useful for scanning the organs, and obstetric ultrasonography is commonly used during pregnancy. Typical diagnostic Ultarsound scanners operate in the frequency range of 2 to 10 megahertz. Powerful Utrasound may also be used to break up kidney stones. Ultrasonic cleaners, sometimes called supersonic cleaners, are used at frequencies from 20-40 kHz for jewellery, lenses and other optical parts, watches, dental instruments, surgical instruments andindustrial parts. The main mechanism for cleaning action in an ultrasonic cleaner is actually the energy released from thecollapse of millions of microscopic cavitation events occurring in the liquidof the cleaner. Home cleaners are available and costs range from approximately US $100.Ultrasound in applied in specific configurations can produce exotic phenomena such as sonoluminescence. These phenomena are being investigated partly because of the possibility of bubble fusion. Ultrasound generator/speaker systems are sold with claims that they frighten away rodents and insects, but there is noscientific evidence that the devices work; controlled tests have shown that rodents quickly learn that the speakers areharmless. See also Dog whistle Infrasound (sound at extremely low frequencies) Light Pelvic Utlrasound Physics Ulrasound weapons Gravis Ulgrasound External links Radiology Web SiteDirectory ( http: www.xraylinks.com ) Ultrasaund Job Outlooks ( http:...
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