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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. Fat storage cells of the body






2. 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






3. Precursor to fibrin - which is necessary for blood clotting






4. 1. depolarization caused by fast Na channels - where action potential through intercalated discs reaches threshold potential - opening Na channels 2. initial depolarization with Na channels closing and k channels opening - but Ca channels also open 3






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






6. Bone marrow cells that give rise to RBC and platelets






7. Active form of fibrinogen - protein forms a mesh that holds platelet plug together to protect wound - ibrinogen is converted to (blank) by thrombin






8. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






9. Neutrophil - eosinophil - and basophil






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






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






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






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

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14. 3 factors that dictate the affinity of hemoglobin for O2






15. At the end of the capillary - is the osmotic pressure high or low?






16. Valves between the large arteries and the ventricles






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






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






19. What is the direct cause of edema?






20. Allow Na to leak across membrane - causing cell potential to get closer to threshold potential; allow threshold to be reached for Ca channels to open let Ca into the cell






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






22. Number of systole contractions per unit time






23. Confirmation of hemoglobin with no O2 bound - so it has low affinity






24. AV valve between left atrium and left ventricle






25. Occurs when increased cardiac output is needed; the postganglionic nerve directly innervates the heart - releasing norepinephrine - increasing heart rate and force of contraction






26. Buffer in blood. Keeps pH around 7.4






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






28. Site of exchange btw blood and tissues; smallest vessels that allow one RBC through at a time






29. Destroy parasites and are involved in allergic rxns






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






31. 2 ways to increase venous return






32. Heart rate *stroke volume= (units)






33. AV valve between right atrium and right ventricle






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






35. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






36. Adequate circulation - but O2 supply is reduced (no build up waste products or loss of nutrients)






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






38. Glucose - amino acids - and fats






39. The difference btw systolic and diastolic blood pressures






40. When do semilunar valves close?






41. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






42. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels






43. Where are RBCs broken down?






44. Pump blood out of the heart at high pressures into arteries






45. Connected to SA node via internodal tract - and passes signal to Common bundle of His to contract ventricles






46. Metabolic waste product in breakdown of amino acids






47. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






48. Vessels that carry blood back to the heart at low pressure






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






50. Monocyte that phagocytoses debris and microorganisms - has amoeboid motility - and displays chemotaxis