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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. Universal acceptor






3. 2 chambers of the heart






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






5. 3 factors that dictate the affinity of hemoglobin for O2






6. Highest blood pressure that occurs during ventricular contraction






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






8. ABO blood group and Rh blood group






9. Buffer in blood. Keeps pH around 7.4






10. Breakdown product of the hemogloblin heme group






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






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






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






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






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






16. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






17. Response by CNS when blood pressure is too high






18. Reservoirs where blood collects from veins






19. 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






20. Fat storage cells of the body






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






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






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






24. Excessive bleeding that results from defective proteins






25. Purpose of erythrocytes?






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






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






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






29. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






31. 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






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






33. Store and release histamine and are involved in allergic rxns






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






35. Lipoproteins that enter lacteal vessels of lymphatic system in the intestinal wall






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






37. 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






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






39. Body's mechanism of preventing bleeding






40. Flow of blood through a tissue






41. 2 portal systems to know






42. Neutrophil - eosinophil - and basophil






43. Destroy parasites and are involved in allergic rxns






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






45. Universal donor






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






47. The difference btw systolic and diastolic blood pressures






48. Which is longer - diastole or systole?






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






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






Can you answer 50 questions in 15 minutes?



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