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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. 2 lymphocytes






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






3. Why is the SA node the primary pacemaker?






4. Flow of blood through a tissue






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






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






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






8. 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






9. Protein that maintains oncotic pressure in capillaries






10. AV valve between left atrium and left ventricle






11. What is the direct cause of edema?






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






13. Peptide hormone secreted from the kidneys to increase RBC production in bone marrow






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






15. Highest blood pressure that occurs during ventricular contraction






16. When do Rh antibodies develop?






17. Universal acceptor






18. The principle sugar in blood that maintains a relatively constant concentration for adequate nutrition






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






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






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






22. 2 portal systems to know






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






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






25. Body's mechanism of preventing bleeding






26. Buffer in blood. Keeps pH around 7.4






27. The difference btw systolic and diastolic blood pressures






28. Response by CNS when blood pressure is too high






29. Fat storage cells of the body






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






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






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






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






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






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






36. Number of systole contractions per unit time






37. Amount of blood pumped w/ each systolic contraction






38. At position 6 - missense mutation substitutes valine for glutamate. valine is hydrophobic - where glutamate was charged. It is an autosomal recessive disease where RBCs accumulated in small vessels - heterozygote for (blank) shows resistance to malar






39. Control of by ANS of rate of contraction through the Vagus nerve. Postganglionic release in SA node of ACH inhibits depolarization






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






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






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






43. 3 factors that dictate the affinity of hemoglobin for O2






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






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






46. Which is longer - diastole or systole?






47. 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






48. 2 chambers of the heart






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






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