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






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






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






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






5. Blood clot or scab circulating in bloodstream






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






7. 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






8. The difference btw systolic and diastolic blood pressures






9. AV valve between right atrium and right ventricle






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






11. Heart rate *stroke volume= (units)






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

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13. Resting membrane potential of -90mV and have long duration action potentials






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






15. 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






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






17. Which is longer - diastole or systole?






18. Metabolic waste product in breakdown of amino acids






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






20. Osmotic pressure in capillaries due to plasma proteins






21. Response by CNS when blood pressure is too high






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






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






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






25. Universal acceptor






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






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






28. Flow of blood through a tissue






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






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






31. Where are RBCs broken down?






32. 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






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






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






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






36. 3 substances that can diffuse through intercellular cleft






37. Reservoirs where blood collects from veins






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






39. Connects the two capillary beds of the intestine and the liver






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






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






42. ABO blood group and Rh blood group






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






45. Body's mechanism of preventing bleeding






46. 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






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






48. When the valve of a vein fails and back flow occurs; blood not being moved toward the heart






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






50. 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)