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






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






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






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






5. 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






6. Valves between the large arteries and the ventricles






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






8. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






10. Glucose - amino acids - and fats






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






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






13. Neutrophil - eosinophil - and basophil






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






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






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






17. 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)






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






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






20. 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






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






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






23. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






25. Buffer in blood. Keeps pH around 7.4






26. Why is the SA node the primary pacemaker?






27. Universal donor






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






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






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






31. AV valve between right atrium and right ventricle






32. What is the direct cause of edema?






33. Body's mechanism of preventing bleeding






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






35. Blood clot or scab circulating in bloodstream






36. Occurs when increased cardiac output is needed; the postganglionic nerve directly innervates the heart - releasing norepinephrine - increasing heart rate and force of contraction






37. 2 ways to increase venous return






38. Number of systole contractions per unit time






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






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






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






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






43. ABO blood group and Rh blood group






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






45. Amount of blood pumped w/ each systolic contraction






46. Protein that maintains oncotic pressure in capillaries






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






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






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






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