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






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






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






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






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






6. Universal acceptor






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






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






9. Flow of blood through a tissue






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






11. Path where impulse travels from SA to AV node






12. Breakdown product of the hemogloblin heme group






13. Where do all components of the blood develop from?






14. What is the direct cause of edema?






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






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






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






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






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






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






21. The difference btw systolic and diastolic blood pressures






22. 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






23. Valves between the large arteries and the ventricles






24. 2 ways to increase venous return






25. ABO blood group and Rh blood group






26. Plasma that lacks clotting proteins






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






28. Heart rate *stroke volume= (units)






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


30. Purpose of erythrocytes?






31. Highest blood pressure that occurs during ventricular contraction






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






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






34. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






35. Number of systole contractions per unit time






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






37. What is the most important plasma protein in the body? Why?






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






39. Response by CNS when blood pressure is too low






40. 2 lymphocytes






41. AV valve between right atrium and right ventricle






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






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






44. 2 chambers of the heart






45. 2 portal systems to know






46. 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






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






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






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






50. AV valve between left atrium and left ventricle