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5 Written questions

5 Matching questions

  1. Blastula
  2. Chordate
  3. Second trimester
  4. First trimester
  5. Birth
  1. a the fetus does a tremendous amount of growing; it begins to move around in teh amniotic fluid; its face appears human, and its toes and fingers elongate; by the end of the sixth month, the fetus is 30-36 cm long
  2. b during 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
  3. c childbirth is accomplished by labor, a series of strong unterine contractions; labor can be divided into three distinct stages; in teh first stage, the cervix thins out and dilates, and the amniotic sac ruptures, releasing tis fluids; during this time, contractions are relatively mild; the second stage is characterized by rapid contractions, resulting in the birth of the baby, followed by the cutting of the umbilical cord; during the final stage, the uterus contracts, expelling the placenta and the umbilical cord
  4. d member of the phylum chordata, aimals that at some point during their development have a notochord; a dorsal, hollow nerve cord; pharyngeal slits or clefts; and a muscular, post-anal tail
  5. e a hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals

5 Multiple choice questions

  1. the first complete cleavage of the zygote occurs approximately 32 hours after fertilization; the second cleavage occrus after 60 hours, and the third cleavage after approximately 72 hours, at which point the eight-celled embryo reaches the uterus; as cell division continues, a solid ball of embryonic cell, known as teh morula, is formed; blastulation begins when teh morula develops a fluid-filled cavity called the blastocoel, which by the fourth day becomes a hollow sphere of cells called the blastula; the blatula is the stage of teh embryo that implants in the uterus
  2. in animal development, a series of cell and tissue movements in which the blastula-stage embryo folds inwards, producing a three-layered embryo, the gastrula
  3. 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
  4. bleeding or the abnormal flow of blood
  5. The cord that connects the developing embryo or fetus with the placenta and through which run the umbilical arteries and vein. The matrix (the substance) of the umbilical cord is known as Wharton's jelly and is a rich source of stem cells. At birth the umbilical cord measures about 20 inches (50 cm) in length. The cord is clamped and cut after birth and its residual tip forms the umbilicus (bellybutton).

5 True/False questions

  1. Growthchildbirth is accomplished by labor, a series of strong unterine contractions; labor can be divided into three distinct stages; in teh first stage, the cervix thins out and dilates, and the amniotic sac ruptures, releasing tis fluids; during this time, contractions are relatively mild; the second stage is characterized by rapid contractions, resulting in the birth of the baby, followed by the cutting of the umbilical cord; during the final stage, the uterus contracts, expelling the placenta and the umbilical cord

          

  2. Gametogenesiseggs develop in women and sperm develop in men, which results in the possibility of reproduction occuring

          

  3. Internal developmentthe early development of many animals occurs outside of the mother's body, on land or in water; fish and amphibians lay eggs that are fertilized externally in the water; the embryo develops within the egg, feeding on nutrients stored in the yolk; reptiles, bird, and some mammals (like the duck-billed platypus) develop externally on land; fertillization occurs internally, and the fertilized egg is then laid; eggs provide protection for teh developing embryo; the eggs also include the following embryonic membranes: chorion, allantois, amnion, yolk sac

          

  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. Yolk sac(membrane of eggs) encloses the yolk; blood vessels in the yolk sac transfer food to the developing embryo

          

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