Test your basic knowledge |

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. What is the direct cause of edema?






2. Buffer in blood. Keeps pH around 7.4






3. Highest blood pressure that occurs during ventricular contraction






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






5. Plasma that lacks clotting proteins






6. AV valve between left atrium and left ventricle






7. 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






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






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






10. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






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






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






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






15. Why is the SA node the primary pacemaker?






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






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






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






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






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






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






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






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






24. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






25. Voltage - gated channels that stay open longer than Na channels and open later responsible for the plateau phase of cardiac muscle contraction






26. ABO blood group and Rh blood group






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






28. 2 chambers of the heart






29. Where are RBCs broken down?






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






31. Excessive bleeding that results from defective proteins






32. Response by CNS when blood pressure is too high






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






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






35. Fat storage cells of the body






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






41. Blood clot or scab circulating in bloodstream






42. 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






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






44. 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






45. Neutrophil - eosinophil - and basophil






46. 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






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






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






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






50. Protein that maintains oncotic pressure in capillaries