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






2. Transportation of blood though the body and exchange of material btw blood and tissues






3. 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






4. Amount of blood pumped w/ each systolic contraction






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






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






7. Response by CNS when blood pressure is too low






8. 2 ways to increase venous return






9. Flow of blood through a tissue






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






11. Valves between the large arteries and the ventricles






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






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






14. Metabolic waste product in breakdown of amino acids






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






16. 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






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






18. 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






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






20. Protein that maintains oncotic pressure in capillaries






21. 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






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






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






24. Path where impulse travels from SA to AV node






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






26. AV valve between left atrium and left ventricle






27. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






29. When do Rh antibodies develop?






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






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






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






33. When do semilunar valves close?






34. Destroy parasites and are involved in allergic rxns






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






36. Where are RBCs broken down?






37. Buffer in blood. Keeps pH around 7.4






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






39. 2 lymphocytes






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






41. 3 substances that can diffuse through intercellular cleft






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






43. Glucose - amino acids - and fats






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






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






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






47. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






49. Plasma that lacks clotting proteins






50. Heart rate *stroke volume= (units)