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






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






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






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






5. Metabolic waste product in breakdown of amino acids






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






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






8. Reservoirs where blood collects from veins






9. Destroy parasites and are involved in allergic rxns






10. ABO blood group and Rh blood group






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






12. Ensure the one - way flow through the circulatory system






13. 2 portal systems to know






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






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. Response by CNS when blood pressure is too low






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






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


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






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






22. 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






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






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






25. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






26. When do semilunar valves close?






27. Fat storage cells of the body






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






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






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






31. Blood clot or scab circulating in bloodstream






32. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






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






34. Response by CNS when blood pressure is too high






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






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






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






38. Glycoproteins that are coded for by 3 alleles (A - B - i)






39. Protein that maintains oncotic pressure in capillaries






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






41. Pump blood out of the heart at high pressures into arteries






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






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






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






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






46. Valves between the large arteries and the ventricles






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






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






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






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