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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. Bone marrow cells that give rise to RBC and platelets






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






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






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

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5. Universal acceptor






6. Gap junctions in the cardiac muscle - where depolarization is communicated directly btw cytoplasm of neighboring cardiac cells






7. 2 chambers of the heart






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






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






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






11. Number of systole contractions per unit time






12. 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






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






14. Osmotic pressure in capillaries due to plasma proteins






15. What is the direct cause of edema?






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






17. Destroy parasites and are involved in allergic rxns






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






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






20. Buffer in blood. Keeps pH around 7.4






21. AV valve between left atrium and left ventricle






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






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






24. Flow of blood through a tissue






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






26. 2 portal systems to know






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






28. Breakdown product of the hemogloblin heme group






29. Heart rate *stroke volume= (units)






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






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






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






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






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






35. Response by CNS when blood pressure is too low






36. 1. depolarization caused by fast Na channels - where action potential through intercalated discs reaches threshold potential - opening Na channels 2. initial depolarization with Na channels closing and k channels opening - but Ca channels also open 3






37. Plasma that lacks clotting proteins






38. Inadequate blood flow - resulting in tissue damage due to shortage of O2 and nutrients - and increase of metabolic waste






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






40. Amount of blood pumped w/ each systolic contraction






41. What is the most important plasma protein in the body? Why?






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






43. Fat storage cells of the body






44. 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






45. ABO blood group and Rh blood group






46. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






48. 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






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






50. When do Rh antibodies develop?