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






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






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






4. At position 6 - missense mutation substitutes valine for glutamate. valine is hydrophobic - where glutamate was charged. It is an autosomal recessive disease where RBCs accumulated in small vessels - heterozygote for (blank) shows resistance to malar






5. 2 lymphocytes






6. AV valve between right atrium and right ventricle






7. Excessive bleeding that results from defective proteins






8. Valves between the large arteries and the ventricles






9. 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






10. AV valve between left atrium and left ventricle






11. ABO blood group and Rh blood group






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






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






14. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






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






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






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






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






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






21. 3 factors that dictate the affinity of hemoglobin for O2






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






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






24. Which is longer - diastole or systole?






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






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






27. Fat storage cells of the body






28. Response by CNS when blood pressure is too low






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






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






31. Heart rate *stroke volume= (units)






32. Blood clot or scab circulating in bloodstream






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

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34. 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






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






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






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






38. Response by CNS when blood pressure is too high






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






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






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






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






43. 3 substances that can diffuse through intercellular cleft






44. Osmotic pressure in capillaries due to plasma proteins






45. Where are RBCs broken down?






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






47. Metabolic waste product in breakdown of amino acids






48. Universal acceptor






49. Occurs when increased cardiac output is needed; the postganglionic nerve directly innervates the heart - releasing norepinephrine - increasing heart rate and force of contraction






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






Can you answer 50 questions in 15 minutes?



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