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






2. Flow of blood through a tissue






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






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






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






6. Metabolic waste product in breakdown of amino acids






7. Which is longer - diastole or systole?






8. When do Rh antibodies develop?






9. Breakdown product of the hemogloblin heme group






10. ABO blood group and Rh blood group






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






12. Confirmation of hemoglobin with O2 bound - where affinity is high 1. pH 2. pCO2 3.






13. When do semilunar valves close?






14. 2 chambers of the heart






15. 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






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






17. 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






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






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






20. 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)






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






22. Fat storage cells of the body






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






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






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






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






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






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






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






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






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






32. Glucose - amino acids - and fats






33. What is the direct cause of edema?






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






35. Universal acceptor






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






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






38. Blood clot or scab circulating in bloodstream






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






40. Valves between the ventricle and the atria to prevent back flow






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






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






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






44. Body's mechanism of preventing bleeding






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






46. 2 lymphocytes






47. Universal donor






48. Glycoproteins that are coded for by 3 alleles (A - B - i)






49. Buffer in blood. Keeps pH around 7.4






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