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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. Why is the SA node the primary pacemaker?






2. Neutrophil - eosinophil - and basophil






3. Body's mechanism of preventing bleeding






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






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






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






7. Universal acceptor






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






9. When do semilunar valves close?






10. Valves between the large arteries and the ventricles






11. Flow of blood through a tissue






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






13. Purpose of erythrocytes?






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






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






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






17. Inadequate blood flow - resulting in tissue damage due to shortage of O2 and nutrients - and increase of metabolic waste






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






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






20. 2 ways to increase venous return






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






22. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






24. Highest blood pressure that occurs during ventricular contraction






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






26. 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






27. 1. depolarization caused by fast Na channels - where action potential through intercalated discs reaches threshold potential - opening Na channels 2. initial depolarization with Na channels closing and k channels opening - but Ca channels also open 3






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






29. 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






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






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






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






33. 3 substances that can diffuse through intercellular cleft






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






35. Breakdown product of the hemogloblin heme group






36. Which is longer - diastole or systole?






37. AV valve between left atrium and left ventricle






38. Blood clot or scab circulating in bloodstream






39. 2 portal systems to know






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






41. Connects the two capillary beds of the intestine and the liver






42. Response by CNS when blood pressure is too high






43. Number of systole contractions per unit time






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






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






46. Difference in pressure=blood flow (L/min)*resitance ^P=Q*R

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47. 2 lymphocytes






48. 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






49. Where are RBCs broken down?






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







Sorry!:) No result found.

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