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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. Number of systole contractions per unit time






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

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






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






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






6. Where are RBCs broken down?






7. Plasma that lacks clotting proteins






8. 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






9. 2 lymphocytes






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






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






12. 2 chambers of the heart






13. 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)






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






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






16. At position 6 - missense mutation substitutes valine for glutamate. valine is hydrophobic - where glutamate was charged. It is an autosomal recessive disease where RBCs accumulated in small vessels - heterozygote for (blank) shows resistance to malar






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






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






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






20. 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






21. 2 portal systems to know






22. Precursor to fibrin - which is necessary for blood clotting






23. Purpose of erythrocytes?






24. Receives deoxygenated blood from systemic circulation (superior and inferior vena cava)






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






26. Which is longer - diastole or systole?






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






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






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






30. The difference btw systolic and diastolic blood pressures






31. 3 factors that dictate the affinity of hemoglobin for O2






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






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






34. Blood clot or scab circulating in bloodstream






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






36. Amount of blood pumped w/ each systolic contraction






37. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






39. Protein that maintains oncotic pressure in capillaries






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






41. Body's mechanism of preventing bleeding






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






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






44. Response by CNS when blood pressure is too high






45. Fat storage cells of the body






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






47. 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






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






49. Universal donor






50. Response by CNS when blood pressure is too low