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






2. Response by CNS when blood pressure is too high






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






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






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






6. 2 portal systems to know






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






8. Where are RBCs broken down?






9. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






10. Protein that maintains oncotic pressure in capillaries






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






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






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






14. Body's mechanism of preventing bleeding






15. Breakdown product of the hemogloblin heme group






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






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






18. Amount of blood pumped w/ each systolic contraction






19. Number of systole contractions per unit time






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

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21. Heart rate *stroke volume= (units)






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






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






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






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






26. Valves between the large arteries and the ventricles






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






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






29. Reservoirs where blood collects from veins






30. 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






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






32. Which is longer - diastole or systole?






33. AV valve between right atrium and right ventricle






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






35. Inadequate blood flow - resulting in tissue damage due to shortage of O2 and nutrients - and increase of metabolic waste






36. Highest blood pressure that occurs during ventricular contraction






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






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






39. 2 lymphocytes






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






41. Osmotic pressure in capillaries due to plasma proteins






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






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






44. 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)






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






46. Universal acceptor






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






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






49. Confirmation of hemoglobin with no O2 bound - so it has low affinity






50. The difference btw systolic and diastolic blood pressures