Test your basic knowledge |

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. Blood clot or scab circulating in bloodstream






3. Voltage - gated channels that open quickly; open at threshold potential






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






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






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






7. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






8. Protein in RBC that transport O2 though the blood since O2 is too hydrophobic in plasma; protein has 4 subunits that change confirmation cooperatively depending on the concentration of O2






9. AV valve between left atrium and left ventricle






10. 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






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






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






13. Buffer in blood. Keeps pH around 7.4






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






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






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






17. Glucose - amino acids - and fats






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






19. 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






20. When do semilunar valves close?






21. Path where impulse travels from SA to AV node






22. Store and release histamine and are involved in allergic rxns






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


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






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






26. Fat storage cells of the body






27. Valves between the large arteries and the ventricles






28. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels






29. Flow of blood through a tissue






30. Number of systole contractions per unit time






31. Protein that maintains oncotic pressure in capillaries






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






33. 2 portal systems to know






34. Precursor to fibrin - which is necessary for blood clotting






35. 3 substances that can diffuse through intercellular cleft






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






37. 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)






38. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






39. Why is the SA node the primary pacemaker?






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






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






42. Destroy parasites and are involved in allergic rxns






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






44. Region that initiates start of cardiac cycle - which acts as a pacemaker of the heart; has unstable resting potential due to Na leak channels






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






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






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






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






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






50. 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