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






2. Where are RBCs broken down?






3. Flow of blood through a tissue






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






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






6. Protein that maintains oncotic pressure in capillaries






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






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






9. Fat storage cells of the body






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






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






12. Glucose - amino acids - and fats






13. Heart rate *stroke volume= (units)






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






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






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






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






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






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






20. Breakdown product of the hemogloblin heme group






21. 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






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






23. Metabolic waste product in breakdown of amino acids






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






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






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






27. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






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






30. Response by CNS when blood pressure is too high






31. 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






32. ABO blood group and Rh blood group






33. When do semilunar valves close?






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






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






36. Plasma that lacks clotting proteins






37. 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






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






39. Which is longer - diastole or systole?






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






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






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






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






44. Where do all components of the blood develop from?






45. Body's mechanism of preventing bleeding






46. Universal acceptor






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






48. 3 factors that dictate the affinity of hemoglobin for O2






49. Path where impulse travels from SA to AV node






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