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






2. Body's mechanism of preventing bleeding






3. Valves between the large arteries and the ventricles






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






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






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






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






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






9. Why is the SA node the primary pacemaker?






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






11. Which is longer - diastole or systole?






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






13. 1. depolarization caused by fast Na channels - where action potential through intercalated discs reaches threshold potential - opening Na channels 2. initial depolarization with Na channels closing and k channels opening - but Ca channels also open 3






14. Where are RBCs broken down?






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






16. Heart rate *stroke volume= (units)






17. Blood clot or scab circulating in bloodstream






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






19. What is the direct cause of edema?






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






21. ABO blood group and Rh blood group






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






23. When do Rh antibodies develop?






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






25. Difference in pressure=blood flow (L/min)*resitance ^P=Q*R

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






27. AV valve between right atrium and right ventricle






28. 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






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






30. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






31. Amount of blood pumped w/ each systolic contraction






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






33. Flow of blood through a tissue






34. Highest blood pressure that occurs during ventricular contraction






35. 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






36. As low as pressure gets btw heart beats in arteries






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






38. AV valve between left atrium and left ventricle






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






40. Number of systole contractions per unit time






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






42. Universal acceptor






43. 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






44. 2 ways to increase venous return






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






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






47. Metabolic waste product in breakdown of amino acids






48. Neutrophil - eosinophil - and basophil






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






50. When do semilunar valves close?







Sorry!:) No result found.

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