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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. 2 portal systems to know






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






3. 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






4. Destroy parasites and are involved in allergic rxns






5. 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






6. Metabolic waste product in breakdown of amino acids






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






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






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






10. 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






11. Reservoirs where blood collects from veins






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






13. 2 ways to increase venous return






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






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






16. Active form of fibrinogen - protein forms a mesh that holds platelet plug together to protect wound - ibrinogen is converted to (blank) by thrombin






17. AV valve between right atrium and right ventricle






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






19. Osmotic pressure in capillaries due to plasma proteins






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






21. 2 lymphocytes






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






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






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






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






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






27. Flow of blood through a tissue






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






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






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






31. When do Rh antibodies develop?






32. Why is the SA node the primary pacemaker?






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






34. Response by CNS when blood pressure is too low






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






36. 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






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






38. Glucose - amino acids - and fats






39. Protein that maintains oncotic pressure in capillaries






40. Response by CNS when blood pressure is too high






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






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






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






44. Valves between the large arteries and the ventricles






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






46. When do semilunar valves close?






47. 3 substances that can diffuse through intercellular cleft






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






49. Universal donor






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