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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. Plasma that lacks clotting proteins






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






3. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






4. Where are RBCs broken down?






5. AV valve between right atrium and right ventricle






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






7. Universal donor






8. Neutrophil - eosinophil - and basophil






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






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






11. Monocyte that phagocytoses debris and microorganisms - has amoeboid motility - and displays chemotaxis






12. Which is longer - diastole or systole?






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






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






15. 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






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






17. Heart rate *stroke volume= (units)






18. Response by CNS when blood pressure is too high






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






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






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






22. Body's mechanism of preventing bleeding






23. Excessive bleeding that results from defective proteins






24. Flow from the heart to the rest of the body; pumped by the left side of the heart






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






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






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






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






29. Response by CNS when blood pressure is too low






30. What is the direct cause of edema?






31. Path where impulse travels from SA to AV node






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






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






34. 2 portal systems to know






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






36. 2 lymphocytes






37. Pass through the capillaries in order to patrol the tissue for invading organisms; only macrophages and neutrophils can squeeze through cleft






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






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






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






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






42. First branches from the aorta that provide the heart's blood supply






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






44. 2 chambers of the heart






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






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






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






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






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






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