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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. Where do all components of the blood develop from?






2. Glucose - amino acids - and fats






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






4. Heart rate *stroke volume= (units)






5. Have single layer endothelial cells w/ spaces in between cells called intercellular cleft






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






7. 2 ways to increase venous return






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






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






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






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






12. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






13. Buffer in blood. Keeps pH around 7.4






14. What is the direct cause of edema?






15. Path where impulse travels from SA to AV node






16. ABO blood group and Rh blood group






17. Blood clot or scab circulating in bloodstream






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






19. Absorbed in the intestine and packaged in chylomicrons - which enter the lymphatic system - and dumped into the subclavian vein via the thoracic duct; the liver takes fats once in blood - converts them to another lipoprotein and sends them to adipocy






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






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






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






23. Where are RBCs broken down?






24. Neutrophil - eosinophil - and basophil






25. Flow of blood through a tissue






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






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






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






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






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






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






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






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






34. Universal donor






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






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






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






38. 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






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






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






41. The difference btw systolic and diastolic blood pressures






42. Osmotic pressure in capillaries due to plasma proteins






43. Excessive bleeding that results from defective proteins






44. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






45. Because the veins have essentially 0 pressure - these valves ensure one - way flow - skeletal muscle contraction encourages flow through veins






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






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






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






49. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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







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