NAME

Question types


Start with


Question limit

of 42 available terms

Advertisement Upgrade to remove ads
Print test

5 Written questions

5 Matching questions

  1. Allantois
  2. Growth
  3. Cleavage
  4. Fertilization
  5. Birth
  1. a an egg can be fertilized within 12-24 hours after ovulation; fertilization occurs in the lateral, widest portion of the oviduct when sperm traveling from the vagina encounter an egg; if more than one egg is fertilized, fraternal twins may be conceived
  2. b each embryonic development is characterized by a series of rapid mitotic divisions knows as cleavage; these divisions lead to an increase in cell number without a corresponding growth in cell protoplasm (i.e., the total volume of cytoplasm remains constant); thus, cleavage results in progressively smaller cells, with an increasing ratio of nuclear-to-cytoplasmic material; cleavage also increases the surface-to-volum ration of each cell, thereby improving gas and nutrient exchange; this early developmental process consists of a series of very rapid, synchronous mitotic divisions that converts the zygote's single large cell into a solid ball of cells, known as teh morula, then into the blastula
  3. c the organs increase in size, which is a continual process from infancy to childhood to adulthood
  4. d 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
  5. e (membrane of eggs) this sac-like structure is involved in respiration and excretion and contains numerous blood vessels to transport O2, CO2, water, salt, and nitrogenous wastes

5 Multiple choice questions

  1. in vertebrates, groups of cells along the sides of the neural tube where it pinches off from the ectoderm; the cells migrate to various parts of teh embryo and form pigment cells in the skin and parts of the skull, teeth, adrenal glands, and peripheral nervous system
  2. 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
  3. a structure in the pregnant uterus for nourishing a vivaparous fetus with the mother's blood supply; formed from the uterine lining and the embryonic membranes
  4. a developing human from the 9th week of gestation until birth; has all the major structures of an adult
  5. fter the initial cell division the fate of the resulting daughter cells is not determined -- each has the potent ial to develop into an entire organism. Sometimes this occurs; resulting individuals are genetically identical (in humans, they are called identical twins)

5 True/False questions

  1. Neurulationby the end of gastrulation, regions of the germ layers begin to develop into a rudimentary nervous system; this process is known as neurulation; a rod of mesodermal cells, called teh notochord, develops along the longitudinal axis just under the dorsal layer of the ectoderm; the notochord has an inductive effect on the overlying ectoderm, causing it to bend inward and form a groove along the dorsal surface of teh embryo; the dorsal ectoderm folds on either side of the groove; these neural folds grow upwards and finally fuse, forming a closed tube; this is the neural tube, which give rise to the brain and spinal cord (central nervous system); once the neural tube is formed, it detaches from teh seurface ectoderm; the cells at the tip of each neural fold are called neural crest cells; these cells migrate laterally and give rise to many components of the peripheral nervous system, including the sensory ganglia, autonomic ganglia, adrenal medulla, and schwann cells

          

  2. Endodermthe 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

          

  3. First trimesterthe 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

          

  4. Third 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

          

  5. Yolk saca developing human from the 9th week of gestation until birth; has all the major structures of an adult

          

Create Set