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






2. Bone marrow cells that give rise to RBC and platelets






3. Where are RBCs broken down?






4. When do semilunar valves close?






5. 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






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






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






8. Amount of blood pumped w/ each systolic contraction






9. Reservoirs where blood collects from veins






10. 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






11. Neutrophil - eosinophil - and basophil






12. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






13. What is the direct cause of edema?






14. Response by CNS when blood pressure is too low






15. Number of systole contractions per unit time






16. Stretching to greater degree of heart muscle causes more forceful contraction; stretching increase occur by increasing fluid volume






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






18. Response by CNS when blood pressure is too high






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






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






21. Valves between the ventricle and the atria to prevent back flow






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






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






24. What causes tendency of water flow out of blood?






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






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






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






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






29. Breakdown product of the hemogloblin heme group






30. Highest blood pressure that occurs during ventricular contraction






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






32. 3 factors that dictate the affinity of hemoglobin for O2






33. 2 chambers of the heart






34. 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






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






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






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






38. 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






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






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






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






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






43. 2 lymphocytes






44. Protein that maintains oncotic pressure in capillaries






45. 2 portal systems to know






46. 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)






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






48. 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






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






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