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5 Written questions

5 Matching questions

  1. Hemorrhage
  2. Amnion
  3. Third trimester
  4. Growth
  5. Fetus
  1. a bleeding or the abnormal flow of blood
  2. b the organs increase in size, which is a continual process from infancy to childhood to adulthood
  3. c a developing human from the 9th week of gestation until birth; has all the major structures of an adult
  4. d the seventh and eighth months are characterized by continued rapid growth and further brain development; during the ninth month, antibodies are transported by highly selective active transport from teh mother to the fetus for protection against foreign matter; the growth rate slows and the fetus become less active, as it has less room to move about
  5. e (membrane of eggs) this membrane encloses the amniotic fluid; amniotic fluid provides an aqueous environment that protects the developing embryo from shock

5 Multiple choice questions

  1. the innermost of the three primary germ layers in animal embryos; lines the archeenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract in species that have these structures
  2. (membrane of eggs) encloses the yolk; blood vessels in the yolk sac transfer food to the developing embryo
  3. eggs develop in women and sperm develop in men, which results in the possibility of reproduction occuring
  4. the growing fetus receives oxygen directly from its mother through a specialized cirulatory system; this system not only supplies oxygen and nutrients to the fetus but removes carbon dioxide and metabolic wastes as well; the two components of this system are the placentaa and the umbilical cord, which both develop in teh first few weeks after fertilization
  5. the body organs begin to form; in this process, the cells interact, differentiate, change physical shape, proliferate, and migrate

5 True/False questions

  1. Maturationin animal development, a series of cell and tissue movements in which the blastula-stage embryo folds inwards, producing a three-layered embryo, the gastrula

          

  2. Placenta and Umbilical cord formationthe placenta and the umbilical cord are outgrowths of the four extra-embryonic membranes formed during development: the amnion, chorion, allantois, and yolk sac; the amnion is a thin, tough membrane containing a watery fluid called amniotic fluid; amniotic fluid acts as a shock absorber of external pressure and localized pressure from the uterine contraction during labor; placenta formation begins with the chorion, a membrane that completely surrounds the amnion; a third membrane, the allantois, develops as an outpocketing of the gut; the blood vessels of the allantoid wall enlarge and become the umbilical vessels, which will connect teh fetus to teh developing placenta; the yolk sac, the site of early developmental blood vessels, becomes associated with the umbilical vessels

          

  3. Mesodermthe middle primary germ layer in an animal embryo; develops into the notochord, the lining of the coelom, muscle, skeleton, gonads, kidneys, and most of the circulatory system in species that have thses structures

          

  4. Gestationpregnancy; the state of carrying developing young within the female reproductive tract; human pregnancy is about 9 months (266 days) and can be subdivided into three trimesters

          

  5. First trimesterduring the first weeks, the major organs begin to develop; the heart begins to beat at approximately 22 days, and soon afterwards, the eyes, gonads, limbs, and liver start to form; by five weeks the embryo is 10mm in lenght; by six weeks the embryo has grown to 15mm; the cartilaginous skeleton begins to turn into bone by the seventh week; by the end of eight weeks, most of teh organs have formed, the brain is fairly developed, and the embryo is referred to as a fetus; at teh end of teh third month, the fetus is about 9 cm long