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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. Highest blood pressure that occurs during ventricular contraction






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






3. Plasma that lacks clotting proteins






4. Metabolic waste product in breakdown of amino acids






5. Purpose of erythrocytes?






6. Flow of blood from the heart to the lungs - pumped by the right side of the heart






7. 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






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






9. 3 factors that dictate the affinity of hemoglobin for O2






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






12. Valves between the large arteries and the ventricles






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






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






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






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






17. Path where impulse travels from SA to AV node






18. 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






19. 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






20. Response by CNS when blood pressure is too high






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






22. Voltage - gated channels that open quickly; open at threshold potential






23. Number of systole contractions per unit time






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






25. Buffer in blood. Keeps pH around 7.4






26. Connected to SA node via internodal tract - and passes signal to Common bundle of His to contract ventricles






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






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






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






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






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






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






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






34. Neutrophil - eosinophil - and basophil






35. Universal donor






36. When do Rh antibodies develop?






37. Transportation of blood though the body and exchange of material btw blood and tissues






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






39. When do semilunar valves close?






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






41. AV valve between left atrium and left ventricle






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






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






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






45. 3 substances that can diffuse through intercellular cleft






46. 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






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

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






49. Fat storage cells of the body






50. Flow of blood through a tissue







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