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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. Blood clot or scab circulating in bloodstream






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






3. Which is longer - diastole or systole?






4. Why is the SA node the primary pacemaker?






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






6. Protein that maintains oncotic pressure in capillaries






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






8. 3 substances that can diffuse through intercellular cleft






9. Universal donor






10. Bone marrow cells that give rise to RBC and platelets






11. Vessels where deoxygenated blood from coronary sinus continue to flow into heart






12. Universal acceptor






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






14. Plasma that lacks clotting proteins






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






16. Highest blood pressure that occurs during ventricular contraction






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






18. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






20. Destroy parasites and are involved in allergic rxns






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






22. AV valve between right atrium and right ventricle






23. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






24. When do Rh antibodies develop?






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. 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






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






28. Excessive bleeding that results from defective proteins






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






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






31. Buffer in blood. Keeps pH around 7.4






32. Aggregate at site of damage to a blood vessel and form a platelet plug to stop bleeding






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






34. Valves between the large arteries and the ventricles






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






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






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






38. Amount of blood pumped w/ each systolic contraction






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






40. 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






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






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






43. 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)






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






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






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






47. Response by CNS when blood pressure is too high






48. The difference btw systolic and diastolic blood pressures






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






50. 3 factors that dictate the affinity of hemoglobin for O2