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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. Reservoirs where blood collects from veins






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






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






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






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






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






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






8. 3 substances that can diffuse through intercellular cleft






9. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






10. ABO blood group and Rh blood group






11. Response by CNS when blood pressure is too low






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






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






14. Osmotic pressure in capillaries due to plasma proteins






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






16. Purpose of erythrocytes?






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






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






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






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






21. Muscular pump that forces blood through series of branching vessels






22. Buffer in blood. Keeps pH around 7.4






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






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






25. Excessive bleeding that results from defective proteins






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






27. When do semilunar valves close?






28. Valves between the large arteries and the ventricles






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






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






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






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






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






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






35. Where blood passes through 2 sets of capillaries before returning to the heart; Evolved as direct transport routes






36. Amount of blood pumped w/ each systolic contraction






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






38. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






40. Number of systole contractions per unit time






41. The difference btw systolic and diastolic blood pressures






42. 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






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






44. Fat storage cells of the body






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






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






47. Maximize entry of Ca into the cell by allowing entry of Ca extracellular environment; leads to contraction of actin - myosin fibers






48. Blood clot or scab circulating in bloodstream






49. Breakdown product of the hemogloblin heme group






50. Path where impulse travels from SA to AV node