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






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






3. Breakdown product of the hemogloblin heme group






4. Connects the two capillary beds of the intestine and the liver






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






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






7. Which is longer - diastole or systole?






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






9. 3 factors that dictate the affinity of hemoglobin for O2






10. Purpose of erythrocytes?






11. AV valve between right atrium and right ventricle






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






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






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






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






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






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






18. 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)






19. Excessive bleeding that results from defective proteins






20. The difference btw systolic and diastolic blood pressures






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






22. What is the direct cause of edema?






23. Universal acceptor






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






25. Response by CNS when blood pressure is too high






26. Protein that maintains oncotic pressure in capillaries






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






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






29. AV valve between left atrium and left ventricle






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






31. 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






32. When do Rh antibodies develop?






33. Plasma that lacks clotting proteins






34. 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






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






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






37. ABO blood group and Rh blood group






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






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






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






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






42. Vessels that carry blood back to the heart at low pressure






43. Body's mechanism of preventing bleeding






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






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

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






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






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






49. 2 ways to increase venous return






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