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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. Path where impulse travels from SA to AV node






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






3. AV valve between left atrium and left ventricle






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






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






6. Blood clot or scab circulating in bloodstream






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






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






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






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






11. Reservoirs where blood collects from veins






12. The difference btw systolic and diastolic blood pressures






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






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






15. Neutrophil - eosinophil - and basophil






16. Excessive bleeding that results from defective proteins






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






18. Caused by closure of Ca channels and opening of K channels






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






20. Metabolic waste product in breakdown of amino acids






21. Protein that maintains oncotic pressure in capillaries






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






23. 2 portal systems to know






24. Where are RBCs broken down?






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






26. Flow of blood through a tissue






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






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






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






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






31. Universal acceptor






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






33. Amount of blood pumped w/ each systolic contraction






34. Filling of the ventricles by squeezing of the atria - marks the beginning of the 'dub' sound






35. AV valve between right atrium and right ventricle






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






37. 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






38. Response by CNS when blood pressure is too low






39. Control of by ANS of rate of contraction through the Vagus nerve. Postganglionic release in SA node of ACH inhibits depolarization






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






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






42. 2 chambers of the heart






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






44. 3 substances that can diffuse through intercellular cleft






45. Response by CNS when blood pressure is too high






46. When do Rh antibodies develop?






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






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






49. 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)






50. 2 ways to increase venous return