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






2. Fat storage cells of the body






3. Heart rate *stroke volume= (units)






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






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






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






7. Flow of blood through a tissue






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






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






10. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






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






12. 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






13. Control of by ANS of rate of contraction through the Vagus nerve. Postganglionic release in SA node of ACH inhibits depolarization






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






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






16. Response by CNS when blood pressure is too low






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






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






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






20. Which is longer - diastole or systole?






21. When do semilunar valves close?






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






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






24. 3 factors that dictate the affinity of hemoglobin for O2






25. Universal donor






26. 2 chambers of the heart






27. Why is the SA node the primary pacemaker?






28. 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






29. 2 portal systems to know






30. 2 ways to increase venous return






31. Highest blood pressure that occurs during ventricular contraction






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






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






34. 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






35. ABO blood group and Rh blood group






36. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






37. 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)






38. Filling of the ventricles by squeezing of the atria - marks the beginning of the 'dub' sound






39. Destroy parasites and are involved in allergic rxns






40. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels






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






42. AV valve between right atrium and right ventricle






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






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






45. Neutrophil - eosinophil - and basophil






46. Metabolic waste product in breakdown of amino acids






47. What causes tendency of water flow out of blood?






48. 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






49. Number of systole contractions per unit time






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