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MCAT Biology Circulatory System

Subjects : mcat, health-sciences
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. Caused by closure of Ca channels and opening of K channels






2. 2 portal systems to know






3. Flow of blood through a tissue






4. Capillaries dilate - increasing the cleft size - which allows more H2O to move through to tissues






5. Rh factor that follows dominant pattern (Rh+ in heterozygote)






6. Control of by ANS of rate of contraction through the Vagus nerve. Postganglionic release in SA node of ACH inhibits depolarization






7. The difference btw systolic and diastolic blood pressures






8. When do Rh antibodies develop?






9. Connects the two capillary beds of the intestine and the liver






10. What is the only process RBC use to generate ATP?






11. Heart rate *stroke volume= (units)






12. When the valve of a vein fails and back flow occurs; blood not being moved toward the heart






13. Filling of the ventricles by squeezing of the atria - marks the beginning of the 'dub' sound






14. First branches from the aorta that provide the heart's blood supply






15. Ensure the one - way flow through the circulatory system






16. Protein in RBC that transport O2 though the blood since O2 is too hydrophobic in plasma; protein has 4 subunits that change confirmation cooperatively depending on the concentration of O2






17. Pass through the capillaries in order to patrol the tissue for invading organisms; only macrophages and neutrophils can squeeze through cleft






18. Lipoproteins that enter lacteal vessels of lymphatic system in the intestinal wall






19. Fat storage cells of the body






20. Mother has Rh - blood with Rh+ antibodies that attack the babies Rh+ blood






21. Voltage - gated channels that stay open longer than Na channels and open later responsible for the plateau phase of cardiac muscle contraction






22. Reservoirs where blood collects from veins






23. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






24. Tissue which the cytoplasm of different cells communicate via gap junctions






25. Metabolic waste product in breakdown of amino acids






26. Key proteins for the function of the immune system that are produced and released by B- cells






27. Which is longer - diastole or systole?






28. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






29. Breakdown product of the hemogloblin heme group






30. Plasma that lacks clotting proteins






31. Request by tissues to increase blood flow - where build up of metabolic waste causes arterioles to dialate






32. ABO blood group and Rh blood group






33. 3 substances that can diffuse through intercellular cleft






34. Highest blood pressure that occurs during ventricular contraction






35. Force per unit area exerted by blood on walls of arteries






36. 2 lymphocytes






37. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






38. 3 factors that dictate the affinity of hemoglobin for O2






39. Produced during cell metabolism and diffuses through the endothelial cells into the blood stream - where it is picked up by the liver and converted to forms that can be excreted (all other wastes are picked up by the kidneys)






40. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






41. Aggregate at site of damage to a blood vessel and form a platelet plug to stop bleeding






42. Glucose - amino acids - and fats






43. Glycoproteins that are coded for by 3 alleles (A - B - i)






44. Protein that maintains oncotic pressure in capillaries






45. Have single layer endothelial cells w/ spaces in between cells called intercellular cleft






46. Voltage - gated channels that open quickly; open at threshold potential






47. Transportation of blood though the body and exchange of material btw blood and tissues






48. Difference in pressure=blood flow (L/min)*resitance ^P=Q*R

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49. Is cardiac output the same or different btw the two ventricles?






50. Store and release histamine and are involved in allergic rxns