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

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






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






4. Universal donor






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






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






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






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






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






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






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






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






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






14. Where blood passes through 2 sets of capillaries before returning to the heart; Evolved as direct transport routes






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






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






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






18. Blood clot or scab circulating in bloodstream






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






20. Connected to SA node via internodal tract - and passes signal to Common bundle of His to contract ventricles






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






22. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






23. Purpose of erythrocytes?






24. 2 portal systems to know






25. Reservoirs where blood collects from veins






26. CO2 is soluble in H2O - and thus some is dissolved and carried to lungs and tissues in plasma - O2 is not soluble in plasma at all






27. Why is the SA node the primary pacemaker?






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






29. 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






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






31. Amount of blood pumped w/ each systolic contraction






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






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






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






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






36. Where are RBCs broken down?






37. AV valve between left atrium and left ventricle






38. 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)






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






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






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






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






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






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






45. Response by CNS when blood pressure is too low






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






47. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






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






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






50. 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






Can you answer 50 questions in 15 minutes?



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