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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. Breakdown product of the hemogloblin heme group






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






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






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






5. Neutrophil - eosinophil - and basophil






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

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7. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






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






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






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






11. 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






12. 2 chambers of the heart






13. 1. depolarization caused by fast Na channels - where action potential through intercalated discs reaches threshold potential - opening Na channels 2. initial depolarization with Na channels closing and k channels opening - but Ca channels also open 3






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






15. 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






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






17. Glucose - amino acids - and fats






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






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






20. Highest blood pressure that occurs during ventricular contraction






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






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






23. AV valve between right atrium and right ventricle






24. Flow of blood through a tissue






25. 3 factors that dictate the affinity of hemoglobin for O2






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






27. Response by CNS when blood pressure is too high






28. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels






29. 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






30. Path where impulse travels from SA to AV node






31. 2 ways to increase venous return






32. 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






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






34. Destroy parasites and are involved in allergic rxns






35. Metabolic waste product in breakdown of amino acids






36. 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






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






38. 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






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






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






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






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






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






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






45. 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






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






47. Universal acceptor






48. Buffer in blood. Keeps pH around 7.4






49. Universal donor






50. Fat storage cells of the body