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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. As low as pressure gets btw heart beats in arteries






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






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






4. Excessive bleeding that results from defective proteins






5. 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






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






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






8. 2 portal systems to know






9. Response by CNS when blood pressure is too low






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






11. Voltage - gated channels that stay open longer than Na channels and open later responsible for the plateau phase of cardiac muscle contraction






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






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






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






15. Region that initiates start of cardiac cycle - which acts as a pacemaker of the heart; has unstable resting potential due to Na leak channels






16. Neutrophil - eosinophil - and basophil






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






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






19. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






21. What is the direct cause of edema?






22. Aggregate at site of damage to a blood vessel and form a platelet plug to stop bleeding






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






24. Breakdown product of the hemogloblin heme group






25. 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






26. Osmotic pressure in capillaries due to plasma proteins






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






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






29. Number of systole contractions per unit time






30. The difference btw systolic and diastolic blood pressures






31. Universal donor






32. When do semilunar valves close?






33. Buffer in blood. Keeps pH around 7.4






34. Valves between the large arteries and the ventricles






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






36. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






38. Essentially 0 mmHg - which results b/c of branching of vessels dissipating pressure to overcome resistance






39. 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






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






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






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

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






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






45. 2 chambers of the heart






46. Valves between the ventricle and the atria to prevent back flow






47. 2 lymphocytes






48. Fat storage cells of the body






49. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






50. Metabolic waste product in breakdown of amino acids