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PCAT Biology Vertebrate Embryology

Subjects : pcat, biology
  • Answer 34 questions in 15 minutes.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Occurs in the lateral - widest portion of the oviduct when sperm traveling from the vagina encounter an egg -can occur within 12-24 hours after ovulation

2. Organs increase in size - which is a continual process from infancy to childhood to adulthood

3. Solid ball of embryonic cells when cell division occurs

4. Characterized by rapid contractions - resulting in the birth of the baby - folllowed by the cutting of the umbilical cord

5. If more than one egg is fertilized

6. Includes organogenesis - growth - gametogenesis

7. Eggs develop in women and sperm develop in men - which results in the possibility of reproduction occuring

8. Ex: marsupials and some tropical fish -without a placenta - exchange of food and oxygen between the young and the mother is limited

9. Begins when the morula develops a blastocoel

10. This system not only supplies oxygen and nutrients to the fetus but removes CO2 and metabolic wastes as well -two components of this system are the placenta and umbilical cord - which both develop in the first few weeks after fertilization

11. Encloses the yolk. blood vessels in the yolk sac transfer food to the developing embryo

12. The study of the development of a unicellular zygote into a complete - multicellular organism

13. Characterized by continued rapid growth and further brain development -antibodies are transported by highly selective active transport from the mother to the fetus for protection against foreign matter

14. Uterus contracts - expelling the placenta and the umbilical cord

15. Fluid-filled cavity developed through blastulation

16. Cells at the tip of each neural fold and give rise to sensory ganglia - autonomic ganglia - adrenal medulla - and Schwann cells

17. Lines the inside of the shell. it is a moist membrane that permits gas exchange

18. The fetus does a termendous amount of growing -begins to move around in the amniotic fluid - its face appears human - and its toes and fingers elongate

19. Three-layered structure that is created when cell migrations - once implanted in the uterus - transform the single-cell layer of blastula

20. Integument (including the epidermis - hair - nails - and epithelium of the nose - mouth - and anal canal) - the lens of the eye - the retina and the nervous system

21. Musculoskeletal system - circulatory system - excretory system - gonads - connective tissue throughout the body - and portions of digestive and respiratory organs

22. A rod of mesodermal cells that develops along the longitudinal axis just under the dorsal layer of ectoderm

23. Accomplished by labor

24. Sac-like structure is involved in respiration and excretion and contains numerous blood vessels to transport (2 - CO2 - water - salt - and N wastes

25. The body organs begin to form. in this process - the cells interact - differentiate - change physical shape - proliferate - and migrate

26. A series of rapid mitotic divisions in early embryonic development -lead to an increase in cell number without a corresponding growth in cell protoplasm

27. Cervix thins out and dilates - and the amniotic sac ruptures - releasing its fluids -contractions are relatively mild

28. The embryo develops within the egg - feeding on nutrients stored in the yolk

29. Membrane encloses the amniotic fluid. amniotic fluid provides an aqueous environment that protects the developing embryo from shock

30. Process that - by the end of gastrulation - regions of the germ layers begin to develop into a rudimentary nervous system

31. Major organs begin to develop -cartilaginous skeleton begins to turn into bone by the seventh week -organs will form - brain is fairly developed - and the embryo is referred to as a fetus

32. A series of strong uterine contractions

33. Hollow sphere of cells of cells which is the blastocoel on the fourth day -the stage of the embryo that implants in the uterus

34. Epithelial linings of the digestive and respiratory tracts (including the lungs) and parts of the liver - pancreas - thyroid - and bladder lining