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






2. Universal donor






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






4. Which is longer - diastole or systole?






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






6. 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






7. 2 chambers of the heart






8. 3 factors that dictate the affinity of hemoglobin for O2






9. Path where impulse travels from SA to AV node






10. Peptide hormone secreted from the kidneys to increase RBC production in bone marrow






11. Destroy parasites and are involved in allergic rxns






12. Site of exchange btw blood and tissues; smallest vessels that allow one RBC through at a time






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






14. Response by CNS when blood pressure is too low






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






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

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17. When do Rh antibodies develop?






18. Voltage - gated channels that stay open longer than Na channels and open later responsible for the plateau phase of cardiac muscle contraction






19. Where are RBCs broken down?






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






21. Metabolic waste product in breakdown of amino acids






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






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






24. 2 ways to increase venous return






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






26. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






28. What is the direct cause of edema?






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






30. Fat storage cells of the body






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






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






33. Highest blood pressure that occurs during ventricular contraction






34. Glucose - amino acids - and fats






35. 2 portal systems to know






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






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






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






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






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






41. Hematocrit or RBC those compose 35-45% of the blood; cells are non - nucleated and have no organelles. Acquire ATP through glycolysis have biconcave shape to maximize surface area for binding O2






42. 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






43. Plasma that lacks clotting proteins






44. Universal acceptor






45. Valves between the large arteries and the ventricles






46. When do semilunar valves close?






47. 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






48. 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






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






50. 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