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






2. Heart rate *stroke volume= (units)






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






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






5. Number of systole contractions per unit time






6. Protein that maintains oncotic pressure in capillaries






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






8. AV valve between left atrium and left ventricle






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






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






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






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






13. When do semilunar valves close?






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






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






16. What is the direct cause of edema?






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






18. Path where impulse travels from SA to AV node






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






20. Blood clot or scab circulating in bloodstream






21. 2 lymphocytes






22. Excessive bleeding that results from defective proteins






23. At the end of the capillary - is the osmotic pressure high or low?






24. 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






25. 2 ways to increase venous return






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






27. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






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






29. 3 substances that can diffuse through intercellular cleft






30. ABO blood group and Rh blood group






31. Region that initiates start of cardiac cycle - which acts as a pacemaker of the heart; has unstable resting potential due to Na leak channels






32. 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






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






34. Which is longer - diastole or systole?






35. Valves between the large arteries and the ventricles






36. Difference in pressure=blood flow (L/min)*resitance ^P=Q*R

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37. Body's mechanism of preventing bleeding






38. 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






39. Destroy parasites and are involved in allergic rxns






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






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






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






43. 3 factors that dictate the affinity of hemoglobin for O2






44. Protein in RBC that transport O2 though the blood since O2 is too hydrophobic in plasma; protein has 4 subunits that change confirmation cooperatively depending on the concentration of O2






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






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






47. Metabolic waste product in breakdown of amino acids






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






49. Where are RBCs broken down?






50. When do Rh antibodies develop?