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






2. Amount of blood pumped w/ each systolic contraction






3. 3 substances that can diffuse through intercellular cleft






4. When do semilunar valves close?






5. The difference btw systolic and diastolic blood pressures






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






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






8. AV valve between left atrium and left ventricle






9. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






10. Universal donor






11. Fat storage cells of the body






12. Neutrophil - eosinophil - and basophil






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






14. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






15. 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






16. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






18. Inadequate blood flow - resulting in tissue damage due to shortage of O2 and nutrients - and increase of metabolic waste






19. Response by CNS when blood pressure is too low






20. Stretching to greater degree of heart muscle causes more forceful contraction; stretching increase occur by increasing fluid volume






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






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






23. Buffer in blood. Keeps pH around 7.4






24. Where are RBCs broken down?






25. Number of systole contractions per unit time






26. AV valve between right atrium and right ventricle






27. Destroy parasites and are involved in allergic rxns






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






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






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






31. Flow from the heart to the rest of the body; pumped by the left side of the heart






32. Which is longer - diastole or systole?






33. Response by CNS when blood pressure is too high






34. When do Rh antibodies develop?






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






36. Plasma that lacks clotting proteins






37. Purpose of erythrocytes?






38. Breakdown product of the hemogloblin heme group






39. Universal acceptor






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






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






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

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






44. 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)






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






46. Vessels that carry blood away from the heart at high pressure






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






48. 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






49. 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






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