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






2. Protein that maintains oncotic pressure in capillaries






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






4. What is the direct cause of edema?






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






6. Neutrophil - eosinophil - and basophil






7. Opposing friction force to flow - which increases with decreased radius; determined by degree of contraction of arterial smooth muscle






8. ABO blood group and Rh blood group






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






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






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






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






13. Where are RBCs broken down?






14. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






15. Path where impulse travels from SA to AV node






16. Heart rate *stroke volume= (units)






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






18. 3 factors that dictate the affinity of hemoglobin for O2






19. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






20. Destroy parasites and are involved in allergic rxns






21. 3 substances that can diffuse through intercellular cleft






22. Blood clot or scab circulating in bloodstream






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






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






25. Universal acceptor






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






27. The difference btw systolic and diastolic blood pressures






28. AV valve between right atrium and right ventricle






29. Region that initiates start of cardiac cycle - which acts as a pacemaker of the heart; has unstable resting potential due to Na leak channels






30. What is the most important plasma protein in the body? Why?






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






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






33. Excessive bleeding that results from defective proteins






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






35. 2 chambers of the heart






36. Response by CNS when blood pressure is too low






37. Universal donor






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






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






40. 2 lymphocytes






41. Which is longer - diastole or systole?






42. 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)






43. 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






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

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






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






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






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






49. 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






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