Test your basic knowledge |

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






2. Highest blood pressure that occurs during ventricular contraction






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






4. 2 portal systems to know






5. 2 ways to increase venous return






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






7. 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






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






9. Site of exchange btw blood and tissues; smallest vessels that allow one RBC through at a time






10. Absorbed in the intestine and packaged in chylomicrons - which enter the lymphatic system - and dumped into the subclavian vein via the thoracic duct; the liver takes fats once in blood - converts them to another lipoprotein and sends them to adipocy






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






12. 2 chambers of the heart






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






14. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






16. Purpose of erythrocytes?






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






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






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






20. 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






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






22. Breakdown product of the hemogloblin heme group






23. Where are RBCs broken down?






24. Fat storage cells of the body






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






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






27. Universal donor






28. Body's mechanism of preventing bleeding






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






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






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






32. Neutrophil - eosinophil - and basophil






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






34. Blood clot or scab circulating in bloodstream






35. Valves between the large arteries and the ventricles






36. Which is longer - diastole or systole?






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






38. Flow of blood through a tissue






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






40. Response by CNS when blood pressure is too high






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






42. Heart rate *stroke volume= (units)






43. Reservoirs where blood collects from veins






44. 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






45. 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






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






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






48. The difference in pressure divided blood flow; controlled by the sympathetic nervous system generating adrenergic tone






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






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