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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. Path where impulse travels from SA to AV node






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






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






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






5. Universal donor






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






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






8. 2 portal systems to know






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






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






11. 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






12. 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






13. Where are RBCs broken down?






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






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






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






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






18. Neutrophil - eosinophil - and basophil






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






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






21. Destroy parasites and are involved in allergic rxns






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






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






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






25. 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






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






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






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






29. Response by CNS when blood pressure is too low






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






31. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






32. Glucose - amino acids - and fats






33. Connects the two capillary beds of the intestine and the liver






34. 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






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






36. Amount of blood pumped w/ each systolic contraction






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






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






39. Osmotic pressure in capillaries due to plasma proteins






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






41. Buffer in blood. Keeps pH around 7.4






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






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






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






45. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






46. 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






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






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






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






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







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