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






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






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






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






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






6. 3 substances that can diffuse through intercellular cleft






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






8. Excessive bleeding that results from defective proteins






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






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






11. Buffer in blood. Keeps pH around 7.4






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






13. 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






14. Fat storage cells of the body






15. 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)






16. When do semilunar valves close?






17. 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






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






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






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






21. Heart rate *stroke volume= (units)






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






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






24. Amount of blood pumped w/ each systolic contraction






25. Neutrophil - eosinophil - and basophil






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






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






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






29. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






30. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






31. 2 portal systems to know






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






33. Valves between the large arteries and the ventricles






34. Neural sympathetic input by postganglionic neuron of norepinephrine innervating arterial smooth muscle






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






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






37. Glucose - amino acids - and fats






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






39. ABO blood group and Rh blood group






40. Purpose of erythrocytes?






41. When do Rh antibodies develop?






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






43. Metabolic waste product in breakdown of amino acids






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






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






46. Highest blood pressure that occurs during ventricular contraction






47. The difference btw systolic and diastolic blood pressures






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






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






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






Can you answer 50 questions in 15 minutes?



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