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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. Universal donor






2. Capillaries dilate - increasing the cleft size - which allows more H2O to move through to tissues






3. Transportation of blood though the body and exchange of material btw blood and tissues






4. Number of systole contractions per unit time






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






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






7. 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






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






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






10. Which is longer - diastole or systole?






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






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






13. 2 portal systems to know






14. The difference btw systolic and diastolic blood pressures






15. When do semilunar valves close?






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






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






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

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






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






21. Path where impulse travels from SA to AV node






22. Response by CNS when blood pressure is too low






23. 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






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






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






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






27. 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






28. Excessive bleeding that results from defective proteins






29. Reservoirs where blood collects from veins






30. Flow of blood through a tissue






31. Fat storage cells of the body






32. Response by CNS when blood pressure is too high






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






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






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






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






37. Protein that maintains oncotic pressure in capillaries






38. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






39. Neutrophil - eosinophil - and basophil






40. Neural sympathetic input by postganglionic neuron of norepinephrine innervating arterial smooth muscle






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






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






43. Blood clot or scab circulating in bloodstream






44. Breakdown product of the hemogloblin heme group






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






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






47. Where do all components of the blood develop from?






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






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






50. Where are RBCs broken down?