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






3. 2 lymphocytes






4. Mother has Rh - blood with Rh+ antibodies that attack the babies Rh+ blood






5. Fat storage cells of the body






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






7. 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






8. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






10. Reservoirs where blood collects from veins






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






12. Path where impulse travels from SA to AV node






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






14. 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






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






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






17. 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)






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






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






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






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






22. The difference btw systolic and diastolic blood pressures






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






24. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






25. 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






26. 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






27. Where are RBCs broken down?






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






29. Protein that maintains oncotic pressure in capillaries






30. Blood clot or scab circulating in bloodstream






31. Breakdown product of the hemogloblin heme group






32. What is the direct cause of edema?






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






34. Flow of blood through a tissue






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






36. 2 chambers of the heart






37. ABO blood group and Rh blood group






38. Inadequate blood flow - resulting in tissue damage due to shortage of O2 and nutrients - and increase of metabolic waste






39. Purpose of erythrocytes?






40. Why is the SA node the primary pacemaker?






41. Response by CNS when blood pressure is too low






42. Filling of the ventricles by squeezing of the atria - marks the beginning of the 'dub' sound






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






44. Universal donor






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






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






47. Amount of blood pumped w/ each systolic contraction






48. Peptide hormone secreted from the kidneys to increase RBC production in bone marrow






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






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