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






2. Gap junctions in the cardiac muscle - where depolarization is communicated directly btw cytoplasm of neighboring cardiac cells






3. When do Rh antibodies develop?






4. Receives deoxygenated blood from systemic circulation (superior and inferior vena cava)






5. 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)






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






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






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






9. The principle sugar in blood that maintains a relatively constant concentration for adequate nutrition






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






11. Reservoirs where blood collects from veins






12. CO2 is soluble in H2O - and thus some is dissolved and carried to lungs and tissues in plasma - O2 is not soluble in plasma at all






13. Pool of deoxygenated blood at low pressure - which collects blood from coronary veins - Only deoxygenated blood to not enter the right atrium via the vena cava






14. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






15. When do semilunar valves close?






16. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






17. Purpose of erythrocytes?






18. 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






19. Why is the SA node the primary pacemaker?






20. Glucose - amino acids - and fats






21. Path where impulse travels from SA to AV node






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






23. 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






24. Maximize entry of Ca into the cell by allowing entry of Ca extracellular environment; leads to contraction of actin - myosin fibers






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






26. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






27. AV valve between left atrium and left ventricle






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






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






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






31. Fat storage cells of the body






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






33. AV valve between right atrium and right ventricle






34. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






35. Which is longer - diastole or systole?






36. Universal acceptor






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






38. Blood clot or scab circulating in bloodstream






39. Amount of blood pumped w/ each systolic contraction






40. Because the veins have essentially 0 pressure - these valves ensure one - way flow - skeletal muscle contraction encourages flow through veins






41. Highest blood pressure that occurs during ventricular contraction






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






43. Plasma that lacks clotting proteins






44. Resting membrane potential of -90mV and have long duration action potentials






45. Essentially 0 mmHg - which results b/c of branching of vessels dissipating pressure to overcome resistance






46. Hematocrit or RBC those compose 35-45% of the blood; cells are non - nucleated and have no organelles. Acquire ATP through glycolysis have biconcave shape to maximize surface area for binding O2






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






48. Destroy parasites and are involved in allergic rxns






49. What causes tendency of water flow out of blood?






50. Neutrophil - eosinophil - and basophil







Sorry!:) No result found.

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