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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. Response by CNS when blood pressure is too low






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






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


4. Destroy parasites and are involved in allergic rxns






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






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






7. Protein that maintains oncotic pressure in capillaries






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






9. 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






10. 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)






11. Osmotic pressure in capillaries due to plasma proteins






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






13. Response by CNS when blood pressure is too high






14. 2 ways to increase venous return






15. Amount of blood pumped w/ each systolic contraction






16. 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






17. Muscular pump that forces blood through series of branching vessels






18. Buffer in blood. Keeps pH around 7.4






19. Blood clot or scab circulating in bloodstream






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






21. 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






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






23. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






25. Flow of blood through a tissue






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






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






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






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






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






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






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






33. Body's mechanism of preventing bleeding






34. Breakdown product of the hemogloblin heme group






35. Which is longer - diastole or systole?






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






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






38. Path where impulse travels from SA to AV node






39. 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






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






41. Plasma that lacks clotting proteins






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






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






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






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






46. 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






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






48. AV valve between left atrium and left ventricle






49. Fat storage cells of the body






50. Highest blood pressure that occurs during ventricular contraction