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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. 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






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






3. Blood clot or scab circulating in bloodstream






4. Response by CNS when blood pressure is too high






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






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






7. 2 chambers of the heart






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






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






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. AV valve between left atrium and left ventricle






12. Purpose of erythrocytes?






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






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






15. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






16. 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






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






18. Plasma that lacks clotting proteins






19. ABO blood group and Rh blood group






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






21. Glucose - amino acids - and fats






22. AV valve between right atrium and right ventricle






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






24. Fat storage cells of the body






25. Osmotic pressure in capillaries due to plasma proteins






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






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

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28. Metabolic waste product in breakdown of amino acids






29. Body's mechanism of preventing bleeding






30. 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






31. Pass through the capillaries in order to patrol the tissue for invading organisms; only macrophages and neutrophils can squeeze through cleft






32. Where are RBCs broken down?






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






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






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






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






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






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






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






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






41. CO2 is soluble in H2O - and thus some is dissolved and carried to lungs and tissues in plasma - O2 is not soluble in plasma at all






42. 3 factors that dictate the affinity of hemoglobin for O2






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






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






45. Destroy parasites and are involved in allergic rxns






46. 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






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






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






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






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