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. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






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






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






4. 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






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






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






7. Valves between the large arteries and the ventricles






8. Pump blood out of the heart at high pressures into arteries






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






10. When do semilunar valves close?






11. 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)






12. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






13. Osmotic pressure in capillaries due to plasma proteins






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






15. 3 factors that dictate the affinity of hemoglobin for O2






16. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






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






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






20. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






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






22. Path where impulse travels from SA to AV node






23. Flow of blood from the heart to the lungs - pumped by the right side of the heart






24. Stretching to greater degree of heart muscle causes more forceful contraction; stretching increase occur by increasing fluid volume






25. 2 ways to increase venous return






26. Response by CNS when blood pressure is too high






27. Heart rate *stroke volume= (units)






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






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






30. Purpose of erythrocytes?






31. Glucose - amino acids - and fats






32. Why is the SA node the primary pacemaker?






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






34. 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






35. 2 portal systems to know






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






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






38. 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






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






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






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






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






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






44. Blood clot or scab circulating in bloodstream






45. 3 substances that can diffuse through intercellular cleft






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






47. Metabolic waste product in breakdown of amino acids






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






49. Amount of blood pumped w/ each systolic contraction






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