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






2. Fat storage cells of the body






3. 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






4. Amount of blood pumped w/ each systolic contraction






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






6. 2 chambers of the heart






7. Glucose - amino acids - and fats






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






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






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






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






12. 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






13. Metabolic waste product in breakdown of amino acids






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






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






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






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






18. 2 lymphocytes






19. Neural sympathetic input by postganglionic neuron of norepinephrine innervating arterial smooth muscle






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






21. 2 ways to increase venous return






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






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






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






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






26. Path where impulse travels from SA to AV node






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






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






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






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






31. Flow from the heart to the rest of the body; pumped by the left side of the heart






32. 3 substances that can diffuse through intercellular cleft






33. 2 portal systems to know






34. Why is the SA node the primary pacemaker?






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






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






37. 3 factors that dictate the affinity of hemoglobin for O2






38. Response by CNS when blood pressure is too high






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






40. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






41. What is the direct cause of edema?






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






43. Plasma that lacks clotting proteins






44. Neutrophil - eosinophil - and basophil






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






46. Resting membrane potential of -90mV and have long duration action potentials






47. Valves between the large arteries and the ventricles






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






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






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