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






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






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






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






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






6. Flow of blood from the heart to the lungs - pumped by the right side of the heart






7. AV valve between right atrium and right ventricle






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






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






10. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






11. 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






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






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






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






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






16. When do semilunar valves close?






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






18. Excessive bleeding that results from defective proteins






19. Destroy parasites and are involved in allergic rxns






20. Body's mechanism of preventing bleeding






21. 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






22. Number of systole contractions per unit time






23. Caused by closure of Ca channels and opening of K channels






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






25. Amount of blood pumped w/ each systolic contraction






26. 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






27. Protein that maintains oncotic pressure in capillaries






28. AV valve between left atrium and left ventricle






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






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






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






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






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






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






35. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






37. 3 factors that dictate the affinity of hemoglobin for O2






38. Purpose of erythrocytes?






39. 2 portal systems to know






40. 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






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






42. Path where impulse travels from SA to AV node






43. 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)






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






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






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






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






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






49. Rh factor that follows dominant pattern (Rh+ in heterozygote)






50. Highest blood pressure that occurs during ventricular contraction







Sorry!:) No result found.

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