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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. 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






2. Glucose - amino acids - and fats






3. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






4. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






5. 3 substances that can diffuse through intercellular cleft






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






7. First branches from the aorta that provide the heart's blood supply






8. Pump blood out of the heart at high pressures into arteries






9. Flow of blood through a tissue






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






11. Is cardiac output the same or different btw the two ventricles?






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






13. Destroy parasites and are involved in allergic rxns






14. Osmotic pressure in capillaries due to plasma proteins






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






16. Valves between the large arteries and the ventricles






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






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






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






20. Path where impulse travels from SA to AV node






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






22. Where are RBCs broken down?






23. 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






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






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






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






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






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






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






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






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






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






33. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






34. What is the direct cause of edema?






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






36. Tissue which the cytoplasm of different cells communicate via gap junctions






37. Why is the SA node the primary pacemaker?






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






39. 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






40. Blood clot or scab circulating in bloodstream






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






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






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






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






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






46. Body's mechanism of preventing bleeding






47. Buffer in blood. Keeps pH around 7.4






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






49. Excessive bleeding that results from defective proteins






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