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






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


3. Force per unit area exerted by blood on walls of arteries






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






5. Osmotic pressure in capillaries due to plasma proteins






6. Protein that maintains oncotic pressure in capillaries






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






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






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






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






11. 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






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






13. Plasma that lacks clotting proteins






14. AV valve between right atrium and right ventricle






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






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






17. What is the direct cause of edema?






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






19. 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






20. 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






21. Transportation of blood though the body and exchange of material btw blood and tissues






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






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






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






25. Breakdown product of the hemogloblin heme group






26. Response by CNS when blood pressure is too low






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






28. Reservoirs where blood collects from veins






29. Highest blood pressure that occurs during ventricular contraction






30. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






31. 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






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






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






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






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






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






37. Body's mechanism of preventing bleeding






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






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






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






41. Blood clot or scab circulating in bloodstream






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






43. Glucose - amino acids - and fats






44. AV valve between left atrium and left ventricle






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






46. Flow of blood through a tissue






47. Purpose of erythrocytes?






48. Fat storage cells of the body






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






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