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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. 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






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






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






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






5. AV valve between right atrium and right ventricle






6. Gap junctions in the cardiac muscle - where depolarization is communicated directly btw cytoplasm of neighboring cardiac cells






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






8. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






9. Fat storage cells of the body






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






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. Response by CNS when blood pressure is too low






13. 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






14. 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






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






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






17. Neutrophil - eosinophil - and basophil






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






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






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






21. Universal acceptor






22. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels






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






24. Path where impulse travels from SA to AV node






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






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






27. 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






28. 2 lymphocytes






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






30. Buffer in blood. Keeps pH around 7.4






31. Reservoirs where blood collects from veins






32. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






33. 2 portal systems to know






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






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






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






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






38. Number of systole contractions per unit time






39. Where are RBCs broken down?






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






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






42. Universal donor






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






44. Heart rate *stroke volume= (units)






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






46. What is the direct cause of edema?






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






48. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






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






50. 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







Sorry!:) No result found.

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