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


2. Valves between the large arteries and the ventricles






3. Number of systole contractions per unit time






4. Purpose of erythrocytes?






5. Path where impulse travels from SA to AV node






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






7. The difference btw systolic and diastolic blood pressures






8. Body's mechanism of preventing bleeding






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






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






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






12. Heart rate *stroke volume= (units)






13. 2 lymphocytes






14. Universal acceptor






15. Plasma that lacks clotting proteins






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






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






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






19. Flow of blood through a tissue






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






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






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






23. Universal donor






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






25. Lipoproteins that enter lacteal vessels of lymphatic system in the intestinal wall






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






27. AV valve between left atrium and left ventricle






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






29. Protein that maintains oncotic pressure in capillaries






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






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






32. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






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






35. 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






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






37. Why is the SA node the primary pacemaker?






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






39. Response by CNS when blood pressure is too low






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






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






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






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






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






45. Glucose - amino acids - and fats






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






47. 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






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






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






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