Test your basic knowledge |

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






2. 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






3. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






4. Blood clot or scab circulating in bloodstream






5. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






6. What is the only process RBC use to generate ATP?






7. Which is longer - diastole or systole?






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






9. Response by CNS when blood pressure is too high






10. Large particles consisting of fats - cholesterol - and carrier proteins; transport lipids through the blood stream






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






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






13. Excessive bleeding that results from defective proteins






14. Destroy parasites and are involved in allergic rxns






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






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






17. Purpose of erythrocytes?






18. Flow of blood through a tissue






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






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






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






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






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






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






25. Where are RBCs broken down?






26. What is the direct cause of edema?






27. Path where impulse travels from SA to AV node






28. Allow Na to leak across membrane - causing cell potential to get closer to threshold potential; allow threshold to be reached for Ca channels to open let Ca into the cell






29. Fat storage cells of the body






30. At position 6 - missense mutation substitutes valine for glutamate. valine is hydrophobic - where glutamate was charged. It is an autosomal recessive disease where RBCs accumulated in small vessels - heterozygote for (blank) shows resistance to malar






31. Gap junctions in the cardiac muscle - where depolarization is communicated directly btw cytoplasm of neighboring cardiac cells






32. Maximize entry of Ca into the cell by allowing entry of Ca extracellular environment; leads to contraction of actin - myosin fibers






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






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






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






36. Buffer in blood. Keeps pH around 7.4






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






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






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






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






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






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






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






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






45. Capillaries dilate - increasing the cleft size - which allows more H2O to move through to tissues






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






47. 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






48. When do Rh antibodies develop?






49. Breakdown product of the hemogloblin heme group






50. Number of systole contractions per unit time