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






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






3. Where blood passes through 2 sets of capillaries before returning to the heart; Evolved as direct transport routes






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






5. Heart rate *stroke volume= (units)






6. 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






7. 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






8. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






9. What is the direct cause of edema?






10. Response by CNS when blood pressure is too low






11. Excessive bleeding that results from defective proteins






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






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






14. Response by CNS when blood pressure is too high






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






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






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






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






19. Protein that maintains oncotic pressure in capillaries






20. 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






21. Flow of blood through a tissue






22. Universal donor






23. Which is longer - diastole or systole?






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






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






26. Transportation of blood though the body and exchange of material btw blood and tissues






27. Destroy parasites and are involved in allergic rxns






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






29. 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






30. AV valve between right atrium and right ventricle






31. Blood clot or scab circulating in bloodstream






32. 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






33. Large particles consisting of fats - cholesterol - and carrier proteins; transport lipids through the blood stream






34. Plasma that lacks clotting proteins






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






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






37. Adequate circulation - but O2 supply is reduced (no build up waste products or loss of nutrients)






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






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






40. 2 ways to increase venous return






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






42. 2 portal systems to know






43. When do Rh antibodies develop?






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






45. Vessels that carry blood back to the heart at low pressure






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






47. ABO blood group and Rh blood group






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






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






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