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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. Purpose of erythrocytes?






2. Path where impulse travels from SA to AV node






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

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






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






6. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






7. 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)






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






9. 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






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






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






12. Which is longer - diastole or systole?






13. 2 portal systems to know






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






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






16. Confirmation of hemoglobin with O2 bound - where affinity is high 1. pH 2. pCO2 3.






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






18. Universal donor






19. 3 factors that dictate the affinity of hemoglobin for O2






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






21. Heart rate *stroke volume= (units)






22. ABO blood group and Rh blood group






23. Blood clot or scab circulating in bloodstream






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






25. Number of systole contractions per unit time






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






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






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






29. Muscular pump that forces blood through series of branching vessels






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






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






32. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






34. Valves between the large arteries and the ventricles






35. Large particles consisting of fats - cholesterol - and carrier proteins; transport lipids through the blood stream






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






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






38. Excessive bleeding that results from defective proteins






39. Body's mechanism of preventing bleeding






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






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






42. Reservoirs where blood collects from veins






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






44. Highest blood pressure that occurs during ventricular contraction






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






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






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






48. 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






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






50. When do semilunar valves close?







Sorry!:) No result found.

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