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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. Universal donor






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






3. 2 chambers of the heart






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






5. 2 ways to increase venous return






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






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






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






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






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






11. 3 factors that dictate the affinity of hemoglobin for O2






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






13. Number of systole contractions per unit time






14. Metabolic waste product in breakdown of amino acids






15. What is the direct cause of edema?






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






17. 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






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






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






20. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






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






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






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






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






25. Osmotic pressure in capillaries due to plasma proteins






26. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






27. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






28. Glucose - amino acids - and fats






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






30. Rh factor that follows dominant pattern (Rh+ in heterozygote)






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






32. AV valve between left atrium and left ventricle






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






34. Purpose of erythrocytes?






35. 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






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






37. Amount of blood pumped w/ each systolic contraction






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






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






40. Destroy parasites and are involved in allergic rxns






41. 3 substances that can diffuse through intercellular cleft






42. When do semilunar valves close?






43. Force per unit area exerted by blood on walls of arteries






44. Request by tissues to increase blood flow - where build up of metabolic waste causes arterioles to dialate






45. 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






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






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






48. Universal acceptor






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






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







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