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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. Number of systole contractions per unit time






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






3. What is the direct cause of edema?






4. Destroy parasites and are involved in allergic rxns






5. 3 factors that dictate the affinity of hemoglobin for O2






6. 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






7. Buffer in blood. Keeps pH around 7.4






8. 2 lymphocytes






9. 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






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






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






12. Produced during cell metabolism and diffuses through the endothelial cells into the blood stream - where it is picked up by the liver and converted to forms that can be excreted (all other wastes are picked up by the kidneys)






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






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






15. Path where impulse travels from SA to AV node






16. Amount of blood pumped w/ each systolic contraction






17. 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






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






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






20. Essentially 0 mmHg - which results b/c of branching of vessels dissipating pressure to overcome resistance






21. Response by CNS when blood pressure is too low






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






23. 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






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






25. 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






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






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






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






29. Body's mechanism of preventing bleeding






30. Plasma that lacks clotting proteins






31. Is cardiac output the same or different btw the two ventricles?






32. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






33. Which is longer - diastole or systole?






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






35. Response by CNS when blood pressure is too high






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






37. Excessive bleeding that results from defective proteins






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






39. Osmotic pressure in capillaries due to plasma proteins






40. 2 ways to increase venous return






41. 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






42. Ensure the one - way flow through the circulatory system






43. Universal donor






44. 3 substances that can diffuse through intercellular cleft






45. Confirmation of hemoglobin with no O2 bound - so it has low affinity






46. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






47. Universal acceptor






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






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






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







Sorry!:) No result found.

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