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






2. Which is longer - diastole or systole?






3. 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






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






5. Breakdown product of the hemogloblin heme group






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






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






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






9. AV valve between left atrium and left ventricle






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






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






12. Fat storage cells of the body






13. Body's mechanism of preventing bleeding






14. Glucose - amino acids - and fats






15. Universal donor






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






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






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






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






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






21. Flow of blood through a tissue






22. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






23. Where are RBCs broken down?






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






25. Destroy parasites and are involved in allergic rxns






26. Why is the SA node the primary pacemaker?






27. Peptide hormone secreted from the kidneys to increase RBC production in bone marrow






28. 2 portal systems to know






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






30. Buffer in blood. Keeps pH around 7.4






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






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






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. Rh factor that follows dominant pattern (Rh+ in heterozygote)






35. Valves between the large arteries and the ventricles






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






37. Aggregate at site of damage to a blood vessel and form a platelet plug to stop 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. Purpose of erythrocytes?






40. 2 chambers of the heart






41. Precursor to fibrin - which is necessary for blood clotting






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






43. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






44. Neutrophil - eosinophil - and basophil






45. Opposing friction force to flow - which increases with decreased radius; determined by degree of contraction of arterial smooth muscle






46. 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






47. Hematocrit or RBC those compose 35-45% of the blood; cells are non - nucleated and have no organelles. Acquire ATP through glycolysis have biconcave shape to maximize surface area for binding O2






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






49. Site of exchange btw blood and tissues; smallest vessels that allow one RBC through at a time






50. Number of systole contractions per unit time






Can you answer 50 questions in 15 minutes?



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