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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. Bone marrow cells that give rise to RBC and platelets






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






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






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






5. Highest blood pressure that occurs during ventricular contraction






6. The difference btw systolic and diastolic blood pressures






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






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






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






10. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






11. Body's mechanism of preventing bleeding






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






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






14. Valves between the large arteries and the ventricles






15. Response by CNS when blood pressure is too low






16. Which is longer - diastole or systole?






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






18. Plasma that lacks clotting proteins






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






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






21. Destroy parasites and are involved in allergic rxns






22. 3 substances that can diffuse through intercellular cleft






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






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






25. Tissue which the cytoplasm of different cells communicate via gap junctions






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






27. Response by CNS when blood pressure is too high






28. Rh factor that follows dominant pattern (Rh+ in heterozygote)






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






30. Heart rate *stroke volume= (units)






31. 2 chambers of the heart






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






33. Excessive bleeding that results from defective proteins






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






35. 2 ways to increase venous return






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






37. 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






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






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






40. Where are RBCs broken down?






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






42. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






44. AV valve between right atrium and right ventricle






45. 2 lymphocytes






46. Purpose of erythrocytes?






47. ABO blood group and Rh blood group






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






49. Metabolic waste product in breakdown of amino acids






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