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






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






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






4. Highest blood pressure that occurs during ventricular contraction






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






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






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






8. When do semilunar valves close?






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






10. 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






11. Fat storage cells of the body






12. Monocyte that phagocytoses debris and microorganisms - has amoeboid motility - and displays chemotaxis






13. Amount of blood pumped w/ each systolic contraction






14. Vessels that carry blood back to the heart at low pressure






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






16. Essentially 0 mmHg - which results b/c of branching of vessels dissipating pressure to overcome resistance






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






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






19. Ensure the one - way flow through the circulatory system






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






21. 3 substances that can diffuse through intercellular cleft






22. Plasma that lacks clotting proteins






23. Number of systole contractions per unit time






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






25. Glucose - amino acids - and fats






26. AV valve between right atrium and right ventricle






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






28. Universal acceptor






29. 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






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






31. Which is longer - diastole or systole?






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






33. Destroy parasites and are involved in allergic rxns






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






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






36. 2 chambers of the heart






37. When do Rh antibodies develop?






38. Where are RBCs broken down?






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






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






41. ABO blood group and Rh blood group






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






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






44. The difference in pressure divided blood flow; controlled by the sympathetic nervous system generating adrenergic tone






45. Valves between the large arteries and the ventricles






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






47. Buffer in blood. Keeps pH around 7.4






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






49. 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






50. 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