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






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






4. Protein that maintains oncotic pressure in capillaries






5. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






6. When do Rh antibodies develop?






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






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






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






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






11. 3 substances that can diffuse through intercellular cleft






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






13. Breakdown product of the hemogloblin heme group






14. Valves between the large arteries and the ventricles






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






16. Occurs when increased cardiac output is needed; the postganglionic nerve directly innervates the heart - releasing norepinephrine - increasing heart rate and force of contraction






17. Flow of blood through a tissue






18. Metabolic waste product in breakdown of amino acids






19. The difference btw systolic and diastolic blood pressures






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






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






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






23. Hematocrit or RBC those compose 35-45% of the blood; cells are non - nucleated and have no organelles. Acquire ATP through glycolysis have biconcave shape to maximize surface area for binding O2






24. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






25. Plasma that lacks clotting proteins






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






27. 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






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






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






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






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






32. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






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






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






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






37. Which is longer - diastole or systole?






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






39. Neutrophil - eosinophil - and basophil






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






41. Heart rate *stroke volume= (units)






42. 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






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






44. 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






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






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






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






48. 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






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






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







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