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






2. 2 lymphocytes






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






4. Body's mechanism of preventing bleeding






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






6. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






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






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






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






11. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






12. Flow of blood through a tissue






13. Plasma that lacks clotting proteins






14. Blood clot or scab circulating in bloodstream






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






16. Destroy parasites and are involved in allergic rxns






17. At position 6 - missense mutation substitutes valine for glutamate. valine is hydrophobic - where glutamate was charged. It is an autosomal recessive disease where RBCs accumulated in small vessels - heterozygote for (blank) shows resistance to malar






18. Response by CNS when blood pressure is too low






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






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






21. Heart rate *stroke volume= (units)






22. Protein that maintains oncotic pressure in capillaries






23. Universal donor






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






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






26. Valves between the large arteries and the ventricles






27. Number of systole contractions per unit time






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






29. Metabolic waste product in breakdown of amino acids






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






31. Buffer in blood. Keeps pH around 7.4






32. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






34. Where are RBCs broken down?






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






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






37. 3 substances that can diffuse through intercellular cleft






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






39. AV valve between left atrium and left ventricle






40. 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






41. Glucose - amino acids - and fats






42. Neutrophil - eosinophil - and basophil






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






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. What causes tendency of water flow out of blood?






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






47. 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)






48. Where blood passes through 2 sets of capillaries before returning to the heart; Evolved as direct transport routes






49. Fat storage cells of the body






50. Reservoirs where blood collects from veins






Can you answer 50 questions in 15 minutes?



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