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






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






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






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






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






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






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






8. Heart rate *stroke volume= (units)






9. Amount of blood pumped w/ each systolic contraction






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






11. Number of systole contractions per unit time






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






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






14. 2 chambers of the heart






15. 2 lymphocytes






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






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






18. Response by CNS when blood pressure is too low






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






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






21. Protein that maintains oncotic pressure in capillaries






22. Plasma that lacks clotting proteins






23. 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






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






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






26. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






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






29. As low as pressure gets btw heart beats in arteries






30. 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






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






32. Valves between the ventricle and the atria to prevent back flow






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






34. Osmotic pressure in capillaries due to plasma proteins






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






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






37. Flow of blood through a tissue






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






39. Vessels where deoxygenated blood from coronary sinus continue to flow into heart






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






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






42. The difference in pressure divided blood flow; controlled by the sympathetic nervous system generating adrenergic tone






43. When do Rh antibodies develop?






44. Blood clot or scab circulating in bloodstream






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






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






47. Universal donor






48. Excessive bleeding that results from defective proteins






49. Path where impulse travels from SA to AV node






50. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer