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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. 2 lymphocytes






2. Body's mechanism of preventing bleeding






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






4. 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






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






6. Fat storage cells of the body






7. The principle sugar in blood that maintains a relatively constant concentration for adequate nutrition






8. Heart rate *stroke volume= (units)






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






10. Reservoirs where blood collects from veins






11. Osmotic pressure in capillaries due to plasma proteins






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






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






14. 2 ways to increase venous return






15. 3 substances that can diffuse through intercellular cleft






16. 2 chambers of the heart






17. When do Rh antibodies develop?






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

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






21. Number of systole contractions per unit time






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






23. Purpose of erythrocytes?






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






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






26. Plasma that lacks clotting proteins






27. 3 factors that dictate the affinity of hemoglobin for O2






28. The difference btw systolic and diastolic blood pressures






29. Protein that maintains oncotic pressure in capillaries






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






31. Vessels that carry blood away from the heart at high pressure






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






33. ABO blood group and Rh blood group






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






35. Allow Na to leak across membrane - causing cell potential to get closer to threshold potential; allow threshold to be reached for Ca channels to open let Ca into the cell






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






37. Highest blood pressure that occurs during ventricular contraction






38. Universal acceptor






39. 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






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






41. Amount of blood pumped w/ each systolic contraction






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






43. Path where impulse travels from SA to AV node






44. Buffer in blood. Keeps pH around 7.4






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






46. Where are RBCs broken down?






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






48. 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






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






50. What causes tendency of water flow out of blood?