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






2. Protein that maintains oncotic pressure in capillaries






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






4. Vessels that carry blood back to the heart at low pressure






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






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






7. Response by CNS when blood pressure is too high






8. Body's mechanism of preventing bleeding






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






10. 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






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






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






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






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






15. Buffer in blood. Keeps pH around 7.4






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






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

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18. 2 lymphocytes






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






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






21. Response by CNS when blood pressure is too low






22. Osmotic pressure in capillaries due to plasma proteins






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






24. AV valve between left atrium and left ventricle






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






26. 2 ways to increase venous return






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






28. Heart rate *stroke volume= (units)






29. Universal donor






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






31. Excessive bleeding that results from defective proteins






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






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






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






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






36. Path where impulse travels from SA to AV node






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






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






39. Destroy parasites and are involved in allergic rxns






40. 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






41. 2 chambers of the heart






42. Fat storage cells of the body






43. ABO blood group and Rh blood group






44. Plasma that lacks clotting proteins






45. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






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






48. Request by tissues to increase blood flow - where build up of metabolic waste causes arterioles to dialate






49. Why is the SA node the primary pacemaker?






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