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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. Excessive bleeding that results from defective proteins






2. 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






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






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






5. Metabolic waste product in breakdown of amino acids






6. 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






7. 2 portal systems to know






8. 3 substances that can diffuse through intercellular cleft






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






10. 2 ways to increase venous return






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






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






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






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






15. Path where impulse travels from SA to AV node






16. 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






17. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






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






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






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






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






23. Where are RBCs broken down?






24. Purpose of erythrocytes?






25. Muscular pump that forces blood through series of branching vessels






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






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






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






29. 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






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






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






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






33. Fat storage cells of the body






34. 2 lymphocytes






35. The difference btw systolic and diastolic blood pressures






36. Protein that maintains oncotic pressure in capillaries






37. Produced during cell metabolism and diffuses through the endothelial cells into the blood stream - where it is picked up by the liver and converted to forms that can be excreted (all other wastes are picked up by the kidneys)






38. Why is the SA node the primary pacemaker?






39. Heart rate *stroke volume= (units)






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






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






42. Number of systole contractions per unit time






43. Universal donor






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






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






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






47. Neutrophil - eosinophil - and basophil






48. When do Rh antibodies develop?






49. Reservoirs where blood collects from veins






50. Body's mechanism of preventing bleeding