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






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






3. Protein that maintains oncotic pressure in capillaries






4. When do Rh antibodies develop?






5. Highest blood pressure that occurs during ventricular contraction






6. Response by CNS when blood pressure is too high






7. Why is the SA node the primary pacemaker?






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






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






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






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






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






13. Excessive bleeding that results from defective proteins






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






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






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






17. 3 factors that dictate the affinity of hemoglobin for O2






18. Fat storage cells of the body






19. Glucose - amino acids - and fats






20. Destroy parasites and are involved in allergic rxns






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






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






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






24. Purpose of erythrocytes?






25. AV valve between left atrium and left ventricle






26. Voltage - gated channels that open quickly; open at threshold potential






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






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






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






30. Metabolic waste product in breakdown of amino acids






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






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






33. Peptide hormone secreted from the kidneys to increase RBC production in bone marrow






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






35. Response by CNS when blood pressure is too low






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






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






38. 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






39. Osmotic pressure in capillaries due to plasma proteins






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






41. Plasma that lacks clotting proteins






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






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






44. 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






45. 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)






46. Opposing friction force to flow - which increases with decreased radius; determined by degree of contraction of arterial smooth muscle






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






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






49. Blood clot or scab circulating in bloodstream






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