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






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






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






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






5. Blood clot or scab circulating in bloodstream






6. Metabolic waste product in breakdown of amino acids






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






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






9. Which is longer - diastole or systole?






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






11. Breakdown product of the hemogloblin heme group






12. Excessive bleeding that results from defective proteins






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






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






15. Highest blood pressure that occurs during ventricular contraction






16. When the valve of a vein fails and back flow occurs; blood not being moved toward the heart






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






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






19. 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)






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






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






22. 2 chambers of the heart






23. AV valve between left atrium and left ventricle






24. 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






25. Mother has Rh - blood with Rh+ antibodies that attack the babies Rh+ blood






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






27. Destroy parasites and are involved in allergic rxns






28. Flow of blood through a tissue






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






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






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






33. Reservoirs where blood collects from veins






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






35. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






37. 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






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






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






40. Universal donor






41. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






42. 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






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






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






45. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






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






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






49. 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






50. Why is the SA node the primary pacemaker?







Sorry!:) No result found.

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