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






2. Fat storage cells of the body






3. Metabolic waste product in breakdown of amino acids






4. What is the direct cause of edema?






5. Path where impulse travels from SA to AV node






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






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






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






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






10. Heart rate *stroke volume= (units)






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






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






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






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






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






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






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






18. ABO blood group and Rh blood group






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






20. 2 ways to increase venous return






21. 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






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






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






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






25. Destroy parasites and are involved in allergic rxns






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






27. AV valve between left atrium and left ventricle






28. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






30. Where are RBCs broken down?






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






32. Response by CNS when blood pressure is too low






33. Body's mechanism of preventing bleeding






34. AV valve between right atrium and right ventricle






35. Why is the SA node the primary pacemaker?






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






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






38. 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






39. 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






40. 2 chambers of the heart






41. Neutrophil - eosinophil - and basophil






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






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






44. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






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






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






47. 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






48. Number of systole contractions per unit time






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






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







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