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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. Metabolic waste product in breakdown of amino acids






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






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






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






5. 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






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






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






8. Buffer in blood. Keeps pH around 7.4






9. Valves between the large arteries and the ventricles






10. Universal acceptor






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






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






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






14. 2 chambers of the heart






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






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






17. Neutrophil - eosinophil - and basophil






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






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






20. Response by CNS when blood pressure is too low






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






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






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






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






25. 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






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






27. Destroy parasites and are involved in allergic rxns






28. The difference btw systolic and diastolic blood pressures






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






30. Plasma that lacks clotting proteins






31. Key proteins for the function of the immune system that are produced and released by B- cells






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






33. Fat storage cells of the body






34. Protein that maintains oncotic pressure in capillaries






35. 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)






36. When do semilunar valves close?






37. Breakdown product of the hemogloblin heme group






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






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






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






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






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






43. 2 lymphocytes






44. Highest blood pressure that occurs during ventricular contraction






45. Lipoproteins that enter lacteal vessels of lymphatic system in the intestinal wall






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






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






48. Amount of blood pumped w/ each systolic contraction






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






50. Osmotic pressure in capillaries due to plasma proteins







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