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. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






2. Fat storage cells of the body






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






4. 3 substances that can diffuse through intercellular cleft






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






6. Purpose of erythrocytes?






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. Plasma that lacks clotting proteins






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






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






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






12. 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)






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






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






15. Response by CNS when blood pressure is too low






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






17. 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






18. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






20. Metabolic waste product in breakdown of amino acids






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






22. 3 factors that dictate the affinity of hemoglobin for O2






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






24. Path where impulse travels from SA to AV node






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






26. Aggregate at site of damage to a blood vessel and form a platelet plug to stop bleeding






27. 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






28. What is the direct cause of edema?






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






30. Neutrophil - eosinophil - and basophil






31. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






32. Destroy parasites and are involved in allergic rxns






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






34. Reservoirs where blood collects from veins






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






36. Glucose - amino acids - and fats






37. Amount of blood pumped w/ each systolic contraction






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






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






40. When do semilunar valves close?






41. 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






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






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






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






45. Excessive bleeding that results from defective proteins






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






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






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






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






50. Maximize entry of Ca into the cell by allowing entry of Ca extracellular environment; leads to contraction of actin - myosin fibers